1、1000千克青菜，早晨测得它的含水率为 600)makesmallpic(this,600,1800);\' id=\"aimg_w8Ged\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/20160515/xgk5fnhrzfu.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />，这些菜到了下午测得含水率为 600)makesmallpic(this,600,1800);\' id=\"aimg_nw06Y\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/20160515/ntrbmymnfg1.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />，那么这些菜的重量减少了_____千克。
A: 200B: 300C: 400D: 500
参考答案: C 本题解释:参考答案:C题目详解:青菜中除了水之外的其他成分质量不会变化：用600)makesmallpic(this,600,1800);\' id=\"aimg_VIG4l\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/c9e39127f47f58fb9cbf5437d919e7a1.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />,求出除去水的重量为30千克;用对应量去除以对应量的百分比：即为600)makesmallpic(this,600,1800);\' id=\"aimg_DH382\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/9f11d83bdfd74b1363aec5d0f5f7d3f3.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />千克;600)makesmallpic(this,600,1800);\' id=\"aimg_dFRLF\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/06ce03fa80aa91c31b748ed404f5fe24.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />千克;所以少了400千克;所以，选C。考查点:数量关系>数学运算>浓度问题>溶剂变化

2、(2006江苏，第16题)把浓度为 600)makesmallpic(this,600,1800);\' id=\"aimg_kkVGg\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/20160515/xymulv3ocja.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />、600)makesmallpic(this,600,1800);\' id=\"aimg_L6nVy\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/20160515/lmwmuziyvbi.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />和600)makesmallpic(this,600,1800);\' id=\"aimg_JGCHG\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/20160515/zbbapxpl4lv.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />的某溶液混合在一起，得到浓度为 600)makesmallpic(this,600,1800);\' id=\"aimg_baVMz\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/20160515/wuh3ajy0v3f.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />的溶液50升。已知浓度为 600)makesmallpic(this,600,1800);\' id=\"aimg_z8IPS\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/20160515/lmwmuziyvbi.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />的溶液用量是浓度为 600)makesmallpic(this,600,1800);\' id=\"aimg_SIF95\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/20160515/xymulv3ocja.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />的溶液用量的3倍，浓度为 600)makesmallpic(this,600,1800);\' id=\"aimg_U17Od\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/20160515/lmwmuziyvbi.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />的溶液的用量是多少升?_____
A: 36B: 38C: 44D: 46
参考答案: A 本题解释:参考答案:A题目详解:应用方程法：设600)makesmallpic(this,600,1800);\' id=\"aimg_nbsBY\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/654227bca3b835b5dac84619fb6ebb7a.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />的溶液为x升，则600)makesmallpic(this,600,1800);\' id=\"aimg_Rc4hN\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/04434db9a118c13f296c75f1e1a4b7d5.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />的溶液为3x升：相当于600)makesmallpic(this,600,1800);\' id=\"aimg_gV52I\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/fe60bf86fe05c32c93ad8f6e7ae3ff0e.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />的溶液y升混合;应用十字交叉法：600)makesmallpic(this,600,1800);\' id=\"aimg_E212b\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/d9a47939dbefaa2684ec0bbb803a48a6.jpg\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />所以600)makesmallpic(this,600,1800);\' id=\"aimg_dmQdx\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/3108209ff4c07e794651fdcd123a3c93.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />，即600)makesmallpic(this,600,1800);\' id=\"aimg_gcAGh\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/2a015aa3cf542576cd76b1e9ba21091d.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />;代入方程600)makesmallpic(this,600,1800);\' id=\"aimg_WV3ox\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/8c50a4ee810887fe91873544204bab2b.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />;解得600)makesmallpic(this,600,1800);\' id=\"aimg_IKk86\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/541f4b174892d40f4ac3ee467dda14f9.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />，所以浓为600)makesmallpic(this,600,1800);\' id=\"aimg_r5WW6\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/04434db9a118c13f296c75f1e1a4b7d5.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />的溶液用了600)makesmallpic(this,600,1800);\' id=\"aimg_lZSQ5\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/155587fc022f33fb10b86a84c0798a84.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />升。、所以，选A。考查点:数量关系>数学运算>浓度问题>不同溶液混合

3、有浓度为 600)makesmallpic(this,600,1800);\' id=\"aimg_bi909\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/20160515/qmijntaxln5.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />的盐水若干克，蒸发了一些水分后浓度变成 600)makesmallpic(this,600,1800);\' id=\"aimg_xeRdz\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/20160515/a2ea0yqhilf.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />，再加入300克 600)makesmallpic(this,600,1800);\' id=\"aimg_Q0G93\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/20160515/gcghsr4txkq.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />的盐水后.浓度变为 600)makesmallpic(this,600,1800);\' id=\"aimg_cZ5X2\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/20160515/ofm1hsif2he.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />的盐水，问最初的盐水多少克?_____
A: 200B: 300C: 400D: 500
参考答案: D 本题解释:参考答案600)makesmallpic(this,600,1800);\' src=\"http://www_php168_com/91files/biggrin.gif\" smilieid=\"3\" border=\"0\" alt=\"\" />题目详解:解法一：应用十字交叉法：根据题意，设10%的盐水的质量为600)makesmallpic(this,600,1800);\' id=\"aimg_XGWi8\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/a7bb99f25de614d69355b383c48d3780.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />克，则有600)makesmallpic(this,600,1800);\' id=\"aimg_fSsfF\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/dd7c552c72d5763104968186f6a4b8a1.jpg\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />，故有600)makesmallpic(this,600,1800);\' id=\"aimg_PY11Z\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/f474b431f87a0b85172372952c0232af.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />，解得600)makesmallpic(this,600,1800);\' id=\"aimg_uic56\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/fa43d7a4835ff617a5177217d8fb0c98.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />。则原有的盐水质量为600)makesmallpic(this,600,1800);\' id=\"aimg_etu6y\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/20182ea4dddeee1c697e90444b7ed3bd.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />，所以，选D。解法二：应用方程法：设最初的盐水为600)makesmallpic(this,600,1800);\' id=\"aimg_Xk8Zh\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/714e6db5c71fbacbbae6827a0285ca15.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />克，300克4%的盐水含盐12克，则可以列方程为：600)makesmallpic(this,600,1800);\' id=\"aimg_kG6Ui\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/8102bccc354c95539ff98cb86a3abb22.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />其中：600)makesmallpic(this,600,1800);\' id=\"aimg_f9J66\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/602ac8c0a54bba8562d84cb5820d53e7.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />为盐水混合后的盐含量;600)makesmallpic(this,600,1800);\' id=\"aimg_RVoOG\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/9ca4708dbba82a6503116fee1fad0f40.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />为盐水混合后的盐水质量;解得，600)makesmallpic(this,600,1800);\' id=\"aimg_uK0N8\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/cfd2bfde0f323900736b5686f3fab400.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />克所以，选D。考查点:数量关系>数学运算>浓度问题>不同溶液混合

4、在一杯清水中放入10克盐，然后再加入浓度为600)makesmallpic(this,600,1800);\' id=\"aimg_t3CVC\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/20160515/jwdi0i1z1se.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />的盐水200克，这时配成了浓度为 600)makesmallpic(this,600,1800);\' id=\"aimg_dt7Qz\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/20160515/wtvtdkp1lqi.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />的盐水，问原来杯中有清水多少克?_____
A: 460克B: 490克C: 570克D: 590克
参考答案: D 本题解释:参考答案600)makesmallpic(this,600,1800);\' src=\"http://www_php168_com/91files/biggrin.gif\" smilieid=\"3\" border=\"0\" alt=\"\" />题目详解:应用方程法：假设原有清水质量为600)makesmallpic(this,600,1800);\' id=\"aimg_B5rdy\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/2ee2112f02870e2ac07dc10d0c6d5f44.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />克，根据题意列方程：600)makesmallpic(this,600,1800);\' id=\"aimg_c9W34\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/2b739845b609591d8884d08a28476a9c.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />(克);所以，选D。考查点:数量关系>数学运算>浓度问题>不同溶液混合

5、(2008北京)甲杯中有浓度为 600)makesmallpic(this,600,1800);\' id=\"aimg_AnRXY\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/20160515/kqkbje3vujt.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />的溶液400克，乙杯中有浓度为 600)makesmallpic(this,600,1800);\' id=\"aimg_U0Z1Y\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/20160515/gjmd15dq10t.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />的溶液600克。现在从甲、乙两杯中取出相同总量的溶液，把从甲杯中取出的倒人乙杯中，把从乙杯中取出的倒人甲杯中，使甲、乙两杯溶液的浓度相同。现在两杯溶液的浓度是_____
A: 600)makesmallpic(this,600,1800);\' id=\"aimg_CGPn5\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/20160515/oje0o2zwgpg.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />B: 600)makesmallpic(this,600,1800);\' id=\"aimg_W5FeF\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/20160515/lwfjqsirpwp.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />C: 600)makesmallpic(this,600,1800);\' id=\"aimg_K5W6i\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/20160515/ays2epndb3a.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />D: 600)makesmallpic(this,600,1800);\' id=\"aimg_jGaAa\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/20160515/krynxe5gjve.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />
参考答案: B 本题解释:参考答案:B题目详解:解法一：依题意：无论怎样混合，根据最后溶液状态可知，整个过程相当于将甲、乙两杯溶液混合在一起，因此最终两杯溶液的浓度为：600)makesmallpic(this,600,1800);\' id=\"aimg_iPNP8\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/6b6f514b04bb693ac2278fc00acd6f4c.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />;所以，选B。解法二：先求出从甲、乙两杯中分别取出的质量m：600)makesmallpic(this,600,1800);\' id=\"aimg_PXALT\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/0713cd17fc562eceff947c86a4a797b2.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />600)makesmallpic(this,600,1800);\' id=\"aimg_x444z\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/4a7306b19aa6004622bd728be186bca7.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />600)makesmallpic(this,600,1800);\' id=\"aimg_GeQd4\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/1f2af8bfc523beff1c524270e30c55aa.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />600)makesmallpic(this,600,1800);\' id=\"aimg_O62XX\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/f90eb5e829a4577bb92f8deeea6297cb.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />600)makesmallpic(this,600,1800);\' id=\"aimg_N1jLa\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/689ac68d8b52d937cbbf6cd4a4dd4643.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />600)makesmallpic(this,600,1800);\' id=\"aimg_HIgDe\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/849a491159524ee037bbc2712394ac45.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />克。再求任何一杯(如甲杯)溶液的浓度：600)makesmallpic(this,600,1800);\' id=\"aimg_eHsHu\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/2ae4be9e8a7f115fb411d34f9d118963.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />600)makesmallpic(this,600,1800);\' id=\"aimg_npuiX\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/46e422e54d8578141279b83930783444.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />600)makesmallpic(this,600,1800);\' id=\"aimg_kFJYC\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/44add28953759b624a646f8a3f7b752b.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />600)makesmallpic(this,600,1800);\' id=\"aimg_htxp1\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/a60ea2a5517fa706ab8ad982ef0f5a0b.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />600)makesmallpic(this,600,1800);\' id=\"aimg_xeGC7\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/1a165cac67a849357d3fbc2347fe9be7.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />;所以，选B。考查点:数量关系>数学运算>浓度问题>不同溶液混合

6、甲容器中有 600)makesmallpic(this,600,1800);\' id=\"aimg_OuV5V\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/20160515/lyfcfsapbnm.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />的食盐水300克，乙容器中有 600)makesmallpic(this,600,1800);\' id=\"aimg_CrVFp\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/20160515/pvigv0nz5l1.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />的食盐水120克，往甲、乙两个容器分别倒入等量的水，使两个容器的食盐水浓度一样，问倒入多少克水?_____
A: 300B: 210C: 180D: 150
参考答案: C 本题解释:参考答案:C题目详解:解法一：设倒入水x千克：加水后甲中的食盐质量为600)makesmallpic(this,600,1800);\' id=\"aimg_qygYx\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/75a8abd97da7e8b109ac0922b2e00986.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />千克，食盐水总质量为600)makesmallpic(this,600,1800);\' id=\"aimg_a9413\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/3dfce4ef8bde3686bd00dd204d35c729.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />千克;乙中的食盐质量为600)makesmallpic(this,600,1800);\' id=\"aimg_Kf20e\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/ed6557f4055a47e6d046fb22e38c8463.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />千克，食盐水总质量为600)makesmallpic(this,600,1800);\' id=\"aimg_WtyDB\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/85dc0ddeb26a7289cffa9e49e2ad23ae.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />千克;则由于倒水后浓度相等(浓度=食盐质量/食盐水总质量)：600)makesmallpic(this,600,1800);\' id=\"aimg_EsN5c\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/d184b1b30b1426c9a7d80c787226f567.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />解得600)makesmallpic(this,600,1800);\' id=\"aimg_oouX3\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/a08311a16e97e51bd28a2f95a707875c.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />;所以，选C。解法二：依题意：要使两个容器中食盐水浓度一样，两容器中食盐水重量之比，要与所含的食盐重量之比一样.甲中含盐量：乙中含盐量:600)makesmallpic(this,600,1800);\' id=\"aimg_PkHaM\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/6f8c07d5ea745220532208acd852e13d.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />600)makesmallpic(this,600,1800);\' id=\"aimg_qlrU9\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/7cee2ac14f04e953bc9d344a6601b68d.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />。现在要使：(300克+倒入水)∶(120克+倒入水)600)makesmallpic(this,600,1800);\' id=\"aimg_WOoE7\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/6dc1f3040e5ec9b2155c900efedaa42c.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />.把“300克+倒入水”算作8份，“120克+倒入水”算作5份，每份是：600)makesmallpic(this,600,1800);\' id=\"aimg_zsXZh\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/2499eba3b5f11fb865e859de8f71193d.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />(克);倒入水量是600)makesmallpic(this,600,1800);\' id=\"aimg_us7I3\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/b62b64b9f54443000bea31b7a0177aaa.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />(克);所以，选C。考查点:数量关系>数学运算>浓度问题>不同溶液混合

7、现有浓度为600)makesmallpic(this,600,1800);\' id=\"aimg_WLJQV\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/20160515/r31o1x2e4ch.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />的盐水20千克，再加入多少千克浓度为 600)makesmallpic(this,600,1800);\' id=\"aimg_p2YV0\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/20160515/cz1f4aiy1ry.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />的盐水，可以得到浓度为 600)makesmallpic(this,600,1800);\' id=\"aimg_B6el0\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/20160515/mowcx5hqv34.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />的盐水?_____
A: 26B: 28C: 30D: 31
参考答案: C 本题解释:参考答案:C题目详解:根据题意：600)makesmallpic(this,600,1800);\' id=\"aimg_r8zH1\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/1744bc8e2efc191bfbec202fd06fc5b8.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />盐水和600)makesmallpic(this,600,1800);\' id=\"aimg_Q9Yw7\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/7c05ffba0cd713f19a3d109f4d34b289.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />盐水的比为:600)makesmallpic(this,600,1800);\' id=\"aimg_pQP4s\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/97e5ca3583bbff20bac04fbd9122781c.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />;根据十字交叉法的原理：600)makesmallpic(this,600,1800);\' id=\"aimg_Ix3h9\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/072ec80099c49d4ed52032d3b4f1482a.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />千克;所以，选C。考查点:数量关系>数学运算>浓度问题>不同溶液混合

8、(江苏2007A类，第14题)杯中原有浓度为 600)makesmallpic(this,600,1800);\' id=\"aimg_Q00Oi\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/20160515/vw1lt0qxead.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />的盐水溶液100ml，重复以下操作2次，加入100ml水，充分配合后，倒出100ml溶液，问杯中盐水溶液的浓度变成了多少?_____
A: 600)makesmallpic(this,600,1800);\' id=\"aimg_fG5tb\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/20160515/5cna0f1vd1f.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />B: 600)makesmallpic(this,600,1800);\' id=\"aimg_v308G\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/20160515/kejbvzroqa0.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />C: 600)makesmallpic(this,600,1800);\' id=\"aimg_JUwkm\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/20160515/wm5pn1bn1cg.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />D: 600)makesmallpic(this,600,1800);\' id=\"aimg_Y84u7\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/20160515/kv5pjiqfbut.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />
参考答案: C 本题解释:参考答案:C题目详解:应用公式法：每次操作后，酒精浓度变为原来的100/100+100=0.5;重复操作2次：600)makesmallpic(this,600,1800);\' id=\"aimg_IEEce\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/2294d977cd653377d0d47b669a9e0e0f.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />;所以，选C。考查点:数量关系>数学运算>浓度问题>不同溶液混合

9、(2009国家，第113题)一种溶液，蒸发一定水后，浓度为 600)makesmallpic(this,600,1800);\' id=\"aimg_cKWEg\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/20160515/03mtzkhidnb.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />;再蒸发同样的水，浓度为 600)makesmallpic(this,600,1800);\' id=\"aimg_ckoI9\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/20160515/0odcun1zp1w.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />;第三次蒸发同样多的水后，浓度变为多少?_____
A: 600)makesmallpic(this,600,1800);\' id=\"aimg_MTTkO\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/20160515/cgn2z4p1rpj.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />B: 600)makesmallpic(this,600,1800);\' id=\"aimg_zGGGZ\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/20160515/o5mqnvinkya.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />C: 600)makesmallpic(this,600,1800);\' id=\"aimg_Pb0uX\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/20160515/vcbmu24nnz2.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />D: 600)makesmallpic(this,600,1800);\' id=\"aimg_OKl4w\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/20160515/ngh4s2swc1w.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />
参考答案: D 本题解释:参考答案600)makesmallpic(this,600,1800);\' src=\"http://www_php168_com/91files/biggrin.gif\" smilieid=\"3\" border=\"0\" alt=\"\" />题目详解:设等式进行求解，设蒸发的水为600)makesmallpic(this,600,1800);\' id=\"aimg_V0ei1\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/d9eabb28aa6e8a31b36920bf40be4b38.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />：假设第一次蒸发后，溶质为10，溶液为100，即600)makesmallpic(this,600,1800);\' id=\"aimg_Z952X\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/96624d1b9a44e5a62247b9316ecf18aa.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />;第二次蒸发后，即为600)makesmallpic(this,600,1800);\' id=\"aimg_yX6kP\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/5fecf7a2edb66e374e0a49b497b0f9ff.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />第三次蒸发后，即600)makesmallpic(this,600,1800);\' id=\"aimg_u8LkZ\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/8e0d8b65436a8abc065b1b5f959a5629.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />所以，选D。考查点:数量关系>数学运算>浓度问题>溶剂变化

10、现有一个无限容积的空杯子，先加人1克酒精，再加入2克水，再加入3克酒精，再加人4克水，……，如此下去，问最终杯子中酒精溶液浓度为多少?_____ B: 600)makesmallpic(this,600,1800);\' id=\"aimg_bB5e2\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/20160515/u0mucbtspau.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />C: 600)makesmallpic(this,600,1800);\' id=\"aimg_BVV1V\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/20160515/wdivudgsh01.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />D: 600)makesmallpic(this,600,1800);\' id=\"aimg_RK3ap\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/20160515/klkjmmsisi3.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />
参考答案: D 本题解释:参考答案600)makesmallpic(this,600,1800);\' src=\"http://www_php168_com/91files/biggrin.gif\" smilieid=\"3\" border=\"0\" alt=\"\" />题目详解:把加一次酒精和水看成一个流程：则经过600)makesmallpic(this,600,1800);\' id=\"aimg_nc01s\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/569c35ce6ebf6d9f1ef029ed89a8bd15.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />个流程后，杯子里面有600)makesmallpic(this,600,1800);\' id=\"aimg_CdX70\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/368a722e420b339397165765c2744bbe.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />克酒精，而酒精溶液有：600)makesmallpic(this,600,1800);\' id=\"aimg_nPbf5\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/1c678ef1f38a9f26ec17ddd25bcf8a58.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />克。故此时酒精溶液浓度为：600)makesmallpic(this,600,1800);\' id=\"aimg_f6BrD\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/f8e5647e4bd0a7348a6a8c33f92cf166.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />=600)makesmallpic(this,600,1800);\' id=\"aimg_SB5zb\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/db58cee8def2913d9bd60b899aec15cf.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />;当n趋于无穷大时，溶液浓度趋于600)makesmallpic(this,600,1800);\' id=\"aimg_J3dQI\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/e6b6080bacccb7a8d9f4f8f8420028db.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />，即600)makesmallpic(this,600,1800);\' id=\"aimg_d14Bd\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/c746f9d9762932d07e65a4c470950732.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />。所以，选D。考查点:数量关系>数学运算>浓度问题>不同溶液混合

11、一只猫每天吃由食品 600)makesmallpic(this,600,1800);\' id=\"aimg_jgf41\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/20160515/rogdyu2xsyi.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />和食品 600)makesmallpic(this,600,1800);\' id=\"aimg_K7Ivw\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/20160515/clymdypeakh.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />搅拌成的食物 600)makesmallpic(this,600,1800);\' id=\"aimg_itTXF\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/20160515/w2ctq1sqhtv.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />克，食品 600)makesmallpic(this,600,1800);\' id=\"aimg_SLd2W\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/20160515/4llapxwg2fg.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />的蛋白质含量为 600)makesmallpic(this,600,1800);\' id=\"aimg_gWN6N\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/20160515/qzv5foarhpq.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />，食品 600)makesmallpic(this,600,1800);\' id=\"aimg_j7GY8\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/20160515/clymdypeakh.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />的蛋白质含量为 600)makesmallpic(this,600,1800);\' id=\"aimg_FWEFe\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/20160515/qvqh1nfuv11.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />。如果该猫每天需要 600)makesmallpic(this,600,1800);\' id=\"aimg_f3war\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/20160515/rzxt4qylvsv.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />克蛋白质，问食物中食品 600)makesmallpic(this,600,1800);\' id=\"aimg_W17g4\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/20160515/rogdyu2xsyi.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />的比重是百分之几?_____
A: 600)makesmallpic(this,600,1800);\' id=\"aimg_OHsk4\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/20160515/u5y1r1vuspe.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />B: 600)makesmallpic(this,600,1800);\' id=\"aimg_GO2kO\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/20160515/5wbrkvmy5cj.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />C: 600)makesmallpic(this,600,1800);\' id=\"aimg_hdEk9\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/20160515/04ccrmq4rza.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />D: 600)makesmallpic(this,600,1800);\' id=\"aimg_aD11b\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/20160515/5gpmibwv53d.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />
参考答案: A 本题解释:参考答案:A题目详解:应用方程法：设600)makesmallpic(this,600,1800);\' id=\"aimg_s8MqU\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/9b0991d3725e0d26564c2ac383eb9e61.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />的比重为600)makesmallpic(this,600,1800);\' id=\"aimg_F7JE2\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/51d38db79a1ebfd240d7c725e2d23029.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />，可列方程：600)makesmallpic(this,600,1800);\' id=\"aimg_sxXtO\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/bcf3a1f65760091caa2195ecb71c0459.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />，解得600)makesmallpic(this,600,1800);\' id=\"aimg_LoG17\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/e62a1bed2e8a468a5fd2f9958f5714fe.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />;所以，选A。考查点:数量关系>数学运算>浓度问题>不同溶液混合

12、一杯含盐 600)makesmallpic(this,600,1800);\' id=\"aimg_Q9cZX\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/20160515/fkrojhx4jhz.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />的盐水 600)makesmallpic(this,600,1800);\' id=\"aimg_XS944\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/20160515/aeby5ogzg2r.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />克,要使盐水含盐 600)makesmallpic(this,600,1800);\' id=\"aimg_cdHJZ\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/20160515/3u2jxyfztgp.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />,应该加盐多少克?_____
A: 12.5B: 10C: 5.5D: 5
参考答案: A 本题解释:参考答案:A题目详解:应用工程法：设需要盐600)makesmallpic(this,600,1800);\' id=\"aimg_KA06Z\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/5cb2ea358e401add13a24e07847ef68f.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />克，600)makesmallpic(this,600,1800);\' id=\"aimg_Dv3Lb\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/bd68df5b634459744c9d52c126a1c5ac.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />;600)makesmallpic(this,600,1800);\' id=\"aimg_IlhZh\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/57140dd9bfd5e34bec82a4e49f9c1fd8.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />;所以，选A。考查点:数量关系>数学运算>浓度问题>溶质变化

13、在浓度为 600)makesmallpic(this,600,1800);\' id=\"aimg_LZh9W\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/20160515/fw51e3jyd3a.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />的酒精中加入10千克水，浓度变为 600)makesmallpic(this,600,1800);\' id=\"aimg_Po8OS\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/20160515/dgalj11fgle.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />，再加入L千克纯酒精，浓度变为 600)makesmallpic(this,600,1800);\' id=\"aimg_czIFi\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/20160515/kmyo1jzt1gr.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />，则L为多少千克?_____
A: 8B: 11.7C: 14.6D: 16.4
参考答案: B 本题解释:参考答案:B题目详解:应用十字交叉法：根据题意;第一次混合相当于浓度为600)makesmallpic(this,600,1800);\' id=\"aimg_wqbW3\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/10cab9d3f8764b64b126f51db702a819.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />与600)makesmallpic(this,600,1800);\' id=\"aimg_ZU7kr\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/e7c13942f30f7f8bfc1bcae09f7a1c38.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />的溶液混合：600)makesmallpic(this,600,1800);\' id=\"aimg_OQ18r\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/661cea0a6803ff4085174ae3da47c931.jpg\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />所以75%的酒精与水的比例为600)makesmallpic(this,600,1800);\' id=\"aimg_IHp7H\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/319975fd529ee0a942238e565fd0ae45.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />;水10千克，600)makesmallpic(this,600,1800);\' id=\"aimg_PKpMQ\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/10cab9d3f8764b64b126f51db702a819.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />的酒精8.75千克。混合后共18.75千克。第二次混合，相当于浓度为600)makesmallpic(this,600,1800);\' id=\"aimg_VK6mC\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/f7fcbb8f93b0de91516296a280e4e93f.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />与600)makesmallpic(this,600,1800);\' id=\"aimg_MFaki\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/a4fe160687ce57a07da74216f85f9f2a.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />的溶液混合：600)makesmallpic(this,600,1800);\' id=\"aimg_S1DN8\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/cddc554083197e2955387dfc0befd965.jpg\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />所以600)makesmallpic(this,600,1800);\' id=\"aimg_F88QG\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/f7fcbb8f93b0de91516296a280e4e93f.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />的酒精与纯酒精的比例为600)makesmallpic(this,600,1800);\' id=\"aimg_TjQ8Z\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/2e651d95dfbd21d6ef8b1e1bf1170adc.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />，即18.75：600)makesmallpic(this,600,1800);\' id=\"aimg_ekN31\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/7c17ca15dc995a9337546f62b99ea0f5.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />，600)makesmallpic(this,600,1800);\' id=\"aimg_BECtD\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/ad59bce06dda5a593c0cf97c8f0576e7.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />千克;所以，选B。考查点:数量关系>数学运算>浓度问题>不同溶液混合

14、(2003广东，第9题)从装满100克浓度为 600)makesmallpic(this,600,1800);\' id=\"aimg_Ccbfd\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/20160515/vzlrsx3jdhx.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />的盐水杯中倒出40克盐水倒人清水将杯倒满，这样反复三次后，杯中盐水的浓度是_____。
A: 600)makesmallpic(this,600,1800);\' id=\"aimg_ysUuM\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/20160515/lba5lt1t5d5.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />B: 600)makesmallpic(this,600,1800);\' id=\"aimg_fglvb\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/20160515/13c5kbend1w.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />C: 600)makesmallpic(this,600,1800);\' id=\"aimg_TfArR\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/20160515/kpmvyqvjhva.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />D: 600)makesmallpic(this,600,1800);\' id=\"aimg_lUk6P\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/20160515/lsgudtwlq53.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />
参考答案: A 本题解释:参考答案:A题目详解:根据题意：每次操作后，酒精浓度变为原来的(100-40)/100=0.6;故反复三次后浓度变为：80%×0.6×0.6×0.6=17.28%;所以，选A。考查点:数量关系>数学运算>浓度问题>不同溶液混合

15、有浓度为 600)makesmallpic(this,600,1800);\' id=\"aimg_z8Pi2\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/20160515/5z1rmlbnpqy.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />的溶液若干，加了一定数量的水后，稀释成为 600)makesmallpic(this,600,1800);\' id=\"aimg_yM2Op\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/20160515/h4p0d0ha44g.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />的溶液.如果再加入同样多的水，浓度是多少?_____
A: 600)makesmallpic(this,600,1800);\' id=\"aimg_QMZ6t\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/20160515/cojb2cmdqdo.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />B: 600)makesmallpic(this,600,1800);\' id=\"aimg_Fzixi\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/20160515/1wwrk2ua3ea.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />C: 600)makesmallpic(this,600,1800);\' id=\"aimg_SWX6I\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/20160515/b4ezykar10w.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />D: 600)makesmallpic(this,600,1800);\' id=\"aimg_xK100\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/20160515/qqiau3gv13s.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />
参考答案: A 本题解释:参考答案:A题目详解:应用特殊值法：设第一次加水后，溶液为100克，溶质为48克;由于溶质不变：原来溶度为60%的溶液为600)makesmallpic(this,600,1800);\' id=\"aimg_D0cPj\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/9ebff3bacf26eb675e2e795b88f588bc.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />克;即加的水为：100-80=20;第二次加水后的浓度为：600)makesmallpic(this,600,1800);\' id=\"aimg_UO3l4\" onclick=\"zoom(this, this.src, 0, 0, 0)\" class=\"zoom\" src=\"http://www_php168_com/91files/48ca53a76e7ccde747d3d1abaee09192.png\" onmouseover=\"img_onmouseoverfunc(this)\" onload=\"thumbImg(this)\" border=\"0\" alt=\"\" />所以，选A。考查点:数量关系>数学运算>浓度问题>溶剂变化

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