此括号中的数为257+3⁵=500。D项当选。

58．【解析】A。相邻两项作商，2，3，5，7，（  ），为质数数列，因此括号中的数应为70×11=770，A项当选。

59．【解析】D。二次作差。

-12     -7      2      19     52   （117）        前项减后项

600)makesmallpic(this,600,1800);\' width=\"50\" height=\"12\" src=\"/ewebeditor/uploadfile/2017/03/01/20170301193829984060.png\">600)makesmallpic(this,600,1800);\' width=\"50\" height=\"12\" src=\"/ewebeditor/uploadfile/2017/03/01/20170301193829984060.png\">600)makesmallpic(this,600,1800);\' width=\"50\" height=\"12\" src=\"/ewebeditor/uploadfile/2017/03/01/20170301193829984060.png\">600)makesmallpic(this,600,1800);\' width=\"50\" height=\"12\" src=\"/ewebeditor/uploadfile/2017/03/01/20170301193829984060.png\">600)makesmallpic(this,600,1800);\' width=\"50\" height=\"12\" src=\"/ewebeditor/uploadfile/2017/03/01/20170301193829984060.png\">

-5     -9    -17    -33   （-65）           前项减后项

600)makesmallpic(this,600,1800);\' width=\"50\" height=\"12\" src=\"/ewebeditor/uploadfile/2017/03/01/20170301193829984060.png\">600)makesmallpic(this,600,1800);\' width=\"50\" height=\"12\" src=\"/ewebeditor/uploadfile/2017/03/01/20170301193829984060.png\">600)makesmallpic(this,600,1800);\' width=\"50\" height=\"12\" src=\"/ewebeditor/uploadfile/2017/03/01/20170301193829984060.png\">600)makesmallpic(this,600,1800);\' width=\"50\" height=\"12\" src=\"/ewebeditor/uploadfile/2017/03/01/20170301193829984060.png\">

4      8      16   （32）

因此D项当选。

60.【解析】A。作差后作商。600)makesmallpic(this,600,1800);\' width=\"32\" height=\"24\" style=\"vertical-align: middle;\" border=\"0\" src=\"/ewebeditor/uploadfile/2017/03/01/20170301193828261002.png\">=600)makesmallpic(this,600,1800);\' width=\"33\" height=\"24\" style=\"vertical-align: middle;\" border=\"0\" src=\"/ewebeditor/uploadfile/2017/03/01/20170301193829684061.png\">，600)makesmallpic(this,600,1800);\' width=\"32\" height=\"24\" style=\"vertical-align: middle;\" border=\"0\" src=\"/ewebeditor/uploadfile/2017/03/01/20170301193828003003.png\">=600)makesmallpic(this,600,1800);\' width=\"33\" height=\"24\" style=\"vertical-align: middle;\" border=\"0\" src=\"/ewebeditor/uploadfile/2017/03/01/20170301193829567062.png\">，600)makesmallpic(this,600,1800);\' width=\"32\" height=\"24\" style=\"vertical-align: middle;\" border=\"0\" src=\"/ewebeditor/uploadfile/2017/03/01/20170301193828721004.png\">=600)makesmallpic(this,600,1800);\' width=\"32\" height=\"24\" style=\"vertical-align: middle;\" border=\"0\" src=\"/ewebeditor/uploadfile/2017/03/01/20170301193829134063.png\">，600)makesmallpic(this,600,1800);\' width=\"33\" height=\"23\" style=\"vertical-align: middle;\" border=\"0\" src=\"/ewebeditor/uploadfile/2017/03/01/20170301193828685005.png\">=600)makesmallpic(this,600,1800);\' width=\"33\" height=\"24\" style=\"vertical-align: middle;\" border=\"0\" src=\"/ewebeditor/uploadfile/2017/03/01/20170301193829877064.png\">。只看底数：

42     45     48     54     72   （144）        后项减前项

600)makesmallpic(this,600,1800);\' width=\"50\" height=\"12\" src=\"/ewebeditor/uploadfile/2017/03/01/20170301193829984060.png\">600)makesmallpic(this,600,1800);\' width=\"50\" height=\"12\" src=\"/ewebeditor/uploadfile/2017/03/01/20170301193829984060.png\">600)makesmallpic(this,600,1800);\' width=\"50\" height=\"12\" src=\"/ewebeditor/uploadfile/2017/03/01/20170301193829984060.png\">600)makesmallpic(this,600,1800);\' width=\"50\" height=\"12\" src=\"/ewebeditor/uploadfile/2017/03/01/20170301193829984060.png\">600)makesmallpic(this,600,1800);\' width=\"50\" height=\"12\" src=\"/ewebeditor/uploadfile/2017/03/01/20170301193829984060.png\">

3      3      6      18   （72）            后项除以前项

600)makesmallpic(this,600,1800);\' width=\"50\" height=\"12\" src=\"/ewebeditor/uploadfile/2017/03/01/20170301193829984060.png\">600)makesmallpic(this,600,1800);\' width=\"50\" height=\"12\" src=\"/ewebeditor/uploadfile/2017/03/01/20170301193829984060.png\">600)makesmallpic(this,600,1800);\' width=\"50\" height=\"12\" src=\"/ewebeditor/uploadfile/2017/03/01/20170301193829984060.png\">600)makesmallpic(this,600,1800);\' width=\"50\" height=\"12\" src=\"/ewebeditor/uploadfile/2017/03/01/20170301193829984060.png\">

1      2      3    （4）

因此未知项为600)makesmallpic(this,600,1800);\' width=\"69\" height=\"23\" style=\"vertical-align: middle;\" border=\"0\" src=\"/ewebeditor/uploadfile/2017/03/01/20170301193829492065.png\">，A项当选。

61．【解析】D。设乙的速度为2x，甲的速度为3x，相遇路程和公式600=（2x+3x）×3，解得x=40，甲的速度3x=120千米/小时。因此D项当选。

62．【解析】B。根据容斥原理的公式：在两个集合的情况下：满足A的个数＋满足B的个数－两者都满足的个数=总个数－两者都不满足的个数。因此26+24-17=38-x，解得x=5。两题都答错的人是5个，因此B项当选。

63．【解析】B。1000股股票的市值是：10×1000×（1-5%）×（1+5%）=10000×（1-5%+5%-5%×5%）=9975（元），因此B项当选。

64.【解析】B。以AB为对角线将图形补成长方形，也就是要缺失的两部分面积相同，2×4=x×（6-x），解得x=2或4。B项当选。

65．暂缺

66．【解析