从练习题开始复习GMAT数学
<p> 题海战术是<span word="GMAT">GMAT</span>考试考生们经常用的方法，比较常见的就是在<span word="GMAT">GMAT</span>数学这一块了。有时候题海战术确实是非常好的选择，但是那也要看考生选择的练习题的质量了。关于数学复习的练习题大家是怎么看的呢?小编分享一些不错的练习题给<span word="GMAT">GMAT</span>入门的考生，希望对大家有所帮助：</p><p> 1、<span word="There">There</span> <span word="are">are</span> 1200 <span word="respondents">respondents</span> <span word="to">to</span> <span word="a">a</span> <span word="poll">poll</span>, <span word="each">each</span> <span word="favoring">favoring</span> <span word="their">their</span> <span word="preference">preference</span> <span word="for">for</span> <span word="candidates">candidates</span> <span word="A">A</span>, <span word="B">B</span>, <span word="and">and</span> <span word="C">C</span>. 54% <span word="favored">favored</span> <span word="A">A</span>, 48% <span word="favored">favored</span> <span word="B">B</span>, <span word="and">and</span> 42% <span word="favored">favored</span> <span word="C">C</span>, <span word="and">and</span> <span word="there">there</span> <span word="is">is</span> 30% <span word="favored">favored</span> <span word="both">both</span> <span word="A">A</span> <span word="and">and</span> <span word="B">B</span>. <span word="Whats">Whats</span> <span word="the">the</span> <span word="largest">largest</span> <span word="possible">possible</span> <span word="number">number</span> <span word="of">of</span> <span word="respondents">respondents</span> <span word="favoring">favoring</span> <span word="C">C</span>, <span word="but">but</span> <span word="not">not</span> <span word="C">C</span><span word="B">B</span>, <span word="nor">nor</span> <span word="C">C</span> <span word="A">A</span>.</p><p> 【答案】12000.28=336</p><p> 【思路】题目问只选<span word="C">C</span>的最大可能数是多少，要使这个数最大，就要满足所有选<span word="C">C</span>的人，都不会同时选<span word="A">A</span>或者<span word="B">B</span>。即<span word="P">P</span>=1-<span word="P">P</span>=1-=1-=0.28。</p><p> 2、<span word="A">A</span> <span word="plane">plane</span> <span word="flied">flied</span> <span word="a">a</span> <span word="distance">distance</span> <span word="of">of</span> 800 <span word="miles">miles</span> <span word="at">at</span> 360<span word="m">m</span>/<span word="h">h</span> <span word="with">with</span> <span word="wind">wind</span> <span word="speed">speed</span>. <span word="And">And</span> <span word="flied">flied</span> <span word="back">back</span> <span word="at">at</span> 260<span word="m">m</span>/<span word="h">h</span> <span word="with">with</span> <span word="wind">wind</span> <span word="against">against</span> <span word="it">it</span>. <span word="Whats">Whats</span> <span word="the">the</span> <span word="average">average</span> <span word="speed">speed</span> <span word="of">of</span> <span word="the">the</span> <span word="round">round</span>-<span word="trip">trip</span>?</p><p> 【答案】约等于302<span word="m">m</span>/<span word="h">h</span></p><p> 【思路】将题目理解为单程800<span word="m">m</span>，<span word="round">round</span>-<span word="trip">trip</span> 1600<span word="m">m</span>，两个时速中已计入风速的影响，不另行计算。则第一段距离800<span word="m">m</span>，时速360<span word="m">m</span>/<span word="h">h</span>，用时20/9<span word="h">h</span>;第二段距离800<span word="m">m</span>，时速260<span word="m">m</span>/<span word="h">h</span>，用时40/13<span word="h">h</span>。则全程的平均时速=1600/=9360/31,约等于302<span word="m">m</span>/<span word="h">h</span>。</p><p> 3、<span word="To">To</span> <span word="travel">travel</span> <span word="trip">trip</span> <span word="of">of</span> 40 <span word="miles">miles</span> <span word="the">the</span> <span word="speed">speed</span> <span word="for">for</span> <span word="the">the</span> <span word="first">first</span> <span word="Y">Y</span> <span word="miles">miles</span> <span word="was">was</span> <span word="X">X</span>, <span word="and">and</span> <span word="the">the</span> <span word="speed">speed</span> <span word="for">for</span> <span word="the">the</span> <span word="remaining">remaining</span> 40-<span word="y">y</span> <span word="is">is</span> 1.2<span word="X">X</span>. <span word="What">What</span> <span word="average">average</span> <span word="speed">speed</span>?</p>
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