整理GMAT数学中常考题型
<p> 1、【确认】表示经讨论为确认答案。</p><p> 2、【讨论】表示答案尚未最终确认，请大家提供思路或将题目补充完整。</p><p> 3、括号内数字表示出现次数。</p><p> 1.^2^2-^2^2</p><p> <span word="my">my</span> <span word="ans">ans</span>：-3^</p><p> 【确认】：310^</p><p> 思路：设<span word="n">n</span>=1, <span word="the">the</span> <span word="equation">equation</span> <span word="should">should</span> <span word="be">be</span> <span word="the">the</span> <span word="following">following</span> <span word="one">one</span></p><p> {^2 ^2} - {}^2</p><p> =^2 - ^2= 310^</p><p> 2.<span word="Tom">Tom</span>在下午2：00在某地看见<span word="jerry">jerry</span>，<span word="Tom">Tom</span>的速度是60<span word="mph">mph</span>，<span word="jerry">jerry</span>的速度是50<span word="mph">mph</span>，2：15时<span word="Tom">Tom</span>通过某个出口，问<span word="jerry">jerry</span>什么时候过出口?</p><p> <span word="my">my</span> <span word="ans">ans</span>：2：18</p><p> 【确认】：2：18</p><p> <span word="Toms">Toms</span> <span word="speed">speed</span> <span word="is">is</span> 10<span word="mph">mph</span> <span word="more">more</span> <span word="than">than</span> <span word="jennys">jennys</span>, <span word="and">and</span> <span word="that">that</span> <span word="also">also</span> <span word="mean">mean</span> <span word="that">that</span> <span word="Toms">Toms</span> <span word="speed">speed</span> <span word="per">per</span> <span word="minute">minute</span> <span word="is">is</span> 1/6 <span word="mile">mile</span> <span word="more">more</span> <span word="than">than</span> <span word="jennys">jennys</span>. <span word="Because">Because</span> <span word="the">the</span> <span word="walk">walk</span> <span word="miles">miles</span> <span word="of">of</span> <span word="Tom">Tom</span> <span word="will">will</span> 15 =2.5 <span word="miles">miles</span> <span word="more">more</span> <span word="than">than</span> <span word="jennys">jennys</span> <span word="in">in</span> 15 <span word="minutes">minutes</span> <span word="and">and</span> <span word="the">the</span> <span word="extra">extra</span> <span word="time">time</span> <span word="jenny">jenny</span> <span word="spend">spend</span> <span word="to">to</span> <span word="reach">reach</span> <span word="the">the</span> <span word="exit">exit</span> <span word="is">is</span> 2.5/ = 3 <span word="minutes">minutes</span>, <span word="the">the</span> <span word="result">result</span> <span word="is">is</span> 15+3=18 <span word="minutes">minutes</span> .</p><p> 3. <span word="DS">DS</span>题：一个袋子里有红球和兰球，问有多少个兰球?</p><p> 随机取一个球，是兰球的概率是1/5</p><p> 取出一个兰球后，在随机取一个球，是兰球的概率是1/3</p><p> <span word="my">my</span> <span word="ans">ans</span> :<span word="E">E</span></p><p> 【确认】<span word="E">E</span></p><p> 虽然感觉应该依靠两个条件可以做，列式如下：</p>
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