GRE数学难题总结（三）
<p> 41. <span word="If">If</span> <span word="N">N</span> <span word="is">is</span> <span word="positive">positive</span> <span word="number">number</span>, <span word="the">the</span> <span word="prime">prime</span> <span word="number">number</span> <span word="of">of</span> <span word="between">between</span> <span word="N">N</span>+1 <span word="and">and</span> <span word="N">N</span>+6 <span word="cannot">cannot</span> <span word="be">be</span> :0,1,2,3,4,6 . 0</p><p> 42 .一个班有52个人，平均分数是45，去掉2人的分数，平均是40，问这2人的平均分数是多少。</p><p> 43. 一个<span word="cube">cube</span> <span word="total">total</span> <span word="surface">surface</span> <span word="area">area</span> 382 <span word="square">square</span> <span word="ft">ft</span>,求所有边长。</p><p> 44. 与原点距离和到原点距离比较</p><p> 45. 00的<span word="integer">integer</span>, <span word="p">p</span>^<span word="q">q</span>和<span word="P">P</span>^大小</p><p> 46. 一个公司的电话在3000-3799之间,问其中在3020-3039的概率是多少.</p><p> 47. 和++大小比较</p><p> 48 .一个三角形两个边长分别为3，4，二者夹角<span word="x">x</span>/ 比较<span word="s">s</span>和4<span word="t">t</span>/7</p><p> 50. 一个圆与一个长方形三个边相内切，该长方形两个边分别为<span word="h">h</span>,<span word="k">k</span> ,长方形面积是圆面积4倍，问<span word="h">h</span>/<span word="k">k</span>,和<span word="PI">PI</span>那个大</p><p> 51. <span word="n">n</span>4 从2到<span word="n">n</span>的奇数与从2到<span word="n">n</span>的素数比大小 .</p><p> 52. <span word="q">q</span></p><p> <span word="r">r</span></p><p> <span word="a">a</span>:<span word="the">the</span> <span word="number">number</span> 一个集合里有，另一个没有的。</p><p> <span word="b">b</span>:<span word="a">a</span> <span word="number">number</span> 两个集合里有的</p><p> 注意了，<span word="the">the</span> <span word="number">number</span> 值得是个数，应是1，而<span word="a">a</span> <span word="number">number</span> 只得是具体的数，-3，-6，-9，-12都为负数，应为<span word="a">a</span>大。</p><p> 53. 第一天下雨的概率是70%，第二天下雨的概率是40%，两天均不下雨的概率，</p><p> 54. 斜率为3的一条直线，经过。比较<span word="k">k</span>与2的大小。 <span word="d">d</span></p>
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