GMAT考试1-GMAT数学12月总结(十一)
<p> 241.三个数，问<span word="mean">mean</span>是否等于<span word="medium">medium</span>：</p><p> <span word="a">a</span>)告诉<span word="medium">medium</span>是多少</p><p> <span word="b">b</span>)最大的数、最小的数与中数各自的差均为2。 <span word="B">B</span></p><p> 242. 1994年<span word="fax">fax</span>量80 <span word="billion">billion</span>，<span word="the">the</span> <span word="annual">annual</span> <span word="number">number</span> <span word="of">of</span> <span word="fax">fax</span> <span word="increased">increased</span> <span word="by">by</span> 700 <span word="percentage">percentage</span> <span word="from">from</span> 1987 <span word="to">to</span> 1994，问1987的<span word="fax">fax</span>量是多少<span word="billion">billion</span> ?</p><p> <span word="ANS">ANS</span>: 10</p><p> 243.<span word="DS">DS</span>:<span word="n">n</span> 是一个两位整数, 问<span word="n">n</span>的十位是几?</p><p> <span word="a">a</span>. 10<span word="n">n</span>的百位是2 <span word="b">b</span>. <span word="the">the</span> <span word="tenth">tenth</span> <span word="of">of</span> <span word="n">n</span>-9 <span word="is">is</span> 1 <span word="A">A</span></p><p> 244.有24磅<span word="P">P</span>物质，有25磅<span word="R">R</span>物质，分别从<span word="P">P</span>物质和<span word="R">R</span>物质中各取出若干，按照4：1的比例合成混合物<span word="X">X</span>;再从<span word="P">P</span>物质和<span word="R">R</span>物质中取出若干，按照1：5的比例合成混合物<span word="Y">Y</span>。求混合物<span word="X">X</span>有多少磅?</p><p> 解：设从<span word="P">P</span>物质中取出<span word="A">A</span>磅，从<span word="R">R</span>物质中取出<span word="B">B</span>磅来合成<span word="X">X</span>,则<span word="X">X</span>共<span word="A">A</span>+<span word="B">B</span>磅;从<span word="P">P</span>物质中取出24-<span word="A">A</span>磅，从<span word="R">R</span>物质中取出25-<span word="B">B</span>磅来合成<span word="Y">Y</span>。</p><p> <span word="A">A</span>-<span word="B">B</span>=4：1, ：=1：5，连立两式：<span word="A">A</span>=20, <span word="B">B</span>=5. <span word="X">X</span>=<span word="A">A</span>+<span word="B">B</span>=25</p><p> 245.<span word="N">N</span>是能被14整除的整数，问<span word="N">N</span>是多少?</p><p> 3<span word="N">N</span>能被5整除 <span word="N">N</span>能被28整除 <span word="E">E</span></p><p> 247. <span word="n">n</span>为正整数，<span word="n">n</span>是某个正整数的平方，求<span word="n">n</span>的因子数一定是什么数?</p><p> 一个奇数 不记得 一个质数 可以排除 <span word="ANS">ANS</span>:</p><p> 248.^2的算式中，<span word="X">X</span>可以为所有实数，<span word="C">C</span>为一个常数，<span word="C">C</span>是多少?</p><p> <span word="C">C</span>0 <span word="C">C</span>^2=16 <span word="C">C</span></p><p> 249.<span word="n">n</span>=0.67<span word="K">K</span>9, 能否判断<span word="K">K</span>是否小于3?</p>
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