g友分享gre数学机经讨论题(7)
<p> 下面是参加了海外<span word="gre">gre</span>数学机经的同学分享的<span word="gre">gre</span>数学机经，希望通过自己的分析和解答能给其他<span word="gre">gre</span>考生提供思路和指导，也可以和周边的<span word="g">g</span>友一起来讨论这些题目，对于<span word="gre">gre</span>数学考试的复习是相当有帮助的。</p><p> 31、5!+6!+7!)/ 上下提出5!后约分得：7/486</p><p> 32、<span word="PS">PS</span> 说有两个圆，有图，跟<span word="X">X</span>轴都相切，两圆也相切，小的半径为4，大的半径为6，求过两圆圆心的直线的斜率，图在附件里</p><p> / 2-2 = 2 / 96</p><p> 33、<span word="PS">PS</span> 有个人买东西，<span word="a">a</span>个东西单价为<span word="b">b</span>, 每个<span word="a">a</span>个东西里有12个<span word="boxes">boxes</span>，卖的时候每3个<span word="boxes">boxes</span> 卖4.98吧，最后赚了一倍...记不太清了.</p><p> 题目不全</p><p> 34、<span word="PS">PS</span> 一个数除以2 3 5都余1，问这个数一下选项中最小是多少，我选了61</p><p> 2、3、5的最小公倍数是30，此数定是 30<span word="n">n</span>+1， <span word="n">n</span>为<span word="positive">positive</span> <span word="integer">integer</span></p><p> 35、<span word="DS">DS</span> <span word="a">a</span>^有几个<span word="prime">prime</span> <span word="factors">factors</span>? 1 <span word="b">b</span>^<span word="c">c</span>有3个质因子 2 <span word="a">a</span>^<span word="b">b</span>有4个质因子 <span word="DS">DS</span>： <span word="a">a</span>^ 有几个<span word="prime">prime</span> <span word="factors">factors</span>?</p><p> 1 <span word="a">a</span>^<span word="b">b</span> 3个<span word="prime">prime</span> <span word="number">number</span></p><p> 2 <span word="b">b</span>^<span word="c">c</span> 4个<span word="prime">prime</span> <span word="number">number</span></p><p> 条件1)<span word="b">b</span>^<span word="c">c</span>有3个质因子即<span word="b">b</span>有3个质因子 但不知<span word="a">a</span>有几个质因子 ，无法求解 条件2)<span word="a">a</span>^<span word="b">b</span>有4个质因子即<span word="a">a</span>有4个质因子，则<span word="a">a</span>^有4个<span word="prime">prime</span> <span word="factors">factors</span> 确定 选<span word="B">B</span> 条件1)<span word="a">a</span>^<span word="b">b</span> 3个质因子即<span word="a">a</span>有3个质因子，则<span word="a">a</span>^有3个<span word="prime">prime</span> <span word="factors">factors</span> 确定选<span word="A">A</span></p>
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