GMAT数学题库经典试题解析(2)
<p> 下面为大家整理了<span word="GMAT">GMAT</span>数学题库经典试题解析，供考生们参考，以下是详细内容。</p><p> 14. <span word="X">X</span>的各位和是170. <span word="X">X</span>=20^17-<span word="Y">Y</span>,问<span word="Y">Y</span>. 可选项是从53到6?</p><p> 这个题有些类似那道减去两位数的题。<span word="x">x</span>=10^172^17-<span word="y">y</span>=13107210^17-<span word="y">y</span></p><p> 170-13=157</p><p> 有些问题,如果是157的话，这样末17位都是9的话也不够157.怎么回事? 做法肯定是这么做的!</p><p> 15. <span word="R">R</span>,<span word="T">T</span>,<span word="U">U</span>在圆上,半径为4,弧<span word="RTU">RTU</span>=4/3<span word="PAI">PAI</span>, 问<span word="RU">RU</span>的<span word="SEGMENT">SEGMENT</span> <span word="LENTH">LENTH</span></p><p> 角<span word="ROU">ROU</span>=360<span word="X">X</span>=360<span word="X">X</span>=60，因此<span word="RU">RU</span>= <span word="r">r</span> =4</p><p> 16. <span word="n">n</span>为1~100 间整数，问<span word="n">n</span> 能被4整除的概率。</p><p> <span word="n">n</span>肯定能被2整除.如果<span word="n">n</span>能被4整除，那么<span word="n">n</span>或者<span word="n">n</span>+1能被4整除，在1~100中<span word="n">n</span>能被4整除的有25个.<span word="n">n</span>+1能被4整除的有25个，因此 概率为 /100=1/2</p><p> 3 <span word="s">s</span>/<span word="t">t</span>=64.12=6412/100 .这个题除一下发现结论如下: 1603=6425+3 , 则余数肯定能被3整除，因此只能选45. <span word="E">E</span></p><p> 17. 1. 0</p><p> 其中有一个是<span word="x">x</span>^4-<span word="x">x</span>^5</p><p> <span word="x">x</span>^4-<span word="x">x</span>^5 <span word="x">x</span>^4</p><p> 因为 00 所以上式为 <span word="x">x</span>^4</p><p> 18.<span word="A">A</span> <span word="certain">certain</span> <span word="musical">musical</span> <span word="scale">scale</span> <span word="has">has</span> 13 <span word="kinds">kinds</span>.每种类型有不同的频率。从小到大排列，最大的频率是最小的2倍。除最大的外，剩余的12个成等比排列。若最小的频率是440，则第7个是多少。</p>
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