GMAT数学需要哪些基本功
<p> <span word="GMAT">GMAT</span>数学复习，对于许多准备参加<span word="GMAT">GMAT</span>考试的考生来说，是一个艰苦的过程。虽然<span word="GMAT">GMAT</span>数学考查的内容相当于内地初中，但是将<span word="GMAT">GMAT</span>数学放在英语语境下，让很多考生很不习惯，再加上<span word="GMAT">GMAT</span>数学强调的实际应用能力，更为考生增加了难度。作为<span word="GMAT">GMAT</span>数学基本功的算术，却是内地考生所熟悉的，就让专家帮你支几招，从算术上寻找突破口。</p><p> 一.整数：<span word="integer">integer</span>，<span word="whole">whole</span> <span word="number">number</span></p><p> 1.因子：<span word="factor">factor</span> <span word="or">or</span> <span word="divisor">divisor</span></p><p> <span word="If">If</span> <span word="x">x</span> <span word="and">and</span> <span word="y">y</span> <span word="are">are</span> <span word="integers">integers</span> <span word="and">and</span> <span word="x">x</span>0,<span word="x">x</span> <span word="is">is</span> <span word="a">a</span> <span word="divisor">divisor</span> <span word="of">of</span> <span word="y">y</span> <span word="provided">provided</span> <span word="that">that</span> <span word="y">y</span>=<span word="xn">xn</span> <span word="for">for</span> <span word="some">some</span> <span word="integer">integer</span> <span word="n">n</span>. <span word="In">In</span> <span word="this">this</span> <span word="case">case</span> <span word="y">y</span> <span word="is">is</span> <span word="also">also</span> <span word="said">said</span> <span word="to">to</span> <span word="be">be</span> <span word="divisible">divisible</span> <span word="by">by</span> <span word="x">x</span> <span word="or">or</span> <span word="to">to</span> <span word="be">be</span> <span word="a">a</span> <span word="multiple">multiple</span> <span word="of">of</span> <span word="x">x</span>. <span word="For">For</span> <span word="example">example</span>, 7 <span word="is">is</span> <span word="a">a</span> <span word="divisor">divisor</span> <span word="or">or</span> <span word="factor">factor</span> <span word="of">of</span> 28 <span word="since">since</span> 28=7 4, <span word="but">but</span> 8 <span word="is">is</span> <span word="not">not</span> <span word="a">a</span> <span word="divisor">divisor</span> <span word="of">of</span> 28 <span word="since">since</span> <span word="there">there</span> <span word="is">is</span> <span word="no">no</span> <span word="integer">integer</span> <span word="n">n</span> <span word="such">such</span> <span word="that">that</span> 28=8<span word="n">n</span>.<span word="Divisible">Divisible</span> <span word="adj">adj</span>.可以被整除的 <span word="multiple">multiple</span> <span word="n">n</span>.倍数</p><p> 2.商和余数：<span word="quotients">quotients</span> <span word="and">and</span> <span word="remainders">remainders</span></p><p> 余数和商都可以为0</p><p> 3.奇数和偶数：<span word="odd">odd</span> <span word="and">and</span> <span word="even">even</span> <span word="integers">integers</span></p><p> 奇数和偶数都可以是负数;零一定是偶数</p><p> 4.质数和合数：<span word="prime">prime</span> <span word="numbers">numbers</span> <span word="and">and</span> <span word="composite">composite</span> <span word="numbers">numbers</span></p><p> <span word="A">A</span> <span word="prime">prime</span> <span word="number">number</span> <span word="is">is</span> <span word="a">a</span> <span word="positive">positive</span> <span word="integer">integer</span> <span word="that">that</span> <span word="has">has</span> <span word="exactly">exactly</span> <span word="two">two</span> <span word="different">different</span> <span word="positive">positive</span> <span word="divisors">divisors</span>，1 <span word="and">and</span> <span word="itself">itself</span>. <span word="For">For</span> <span word="example">example</span>, 2,3,5,7,11, <span word="and">and</span> 13 <span word="are">are</span> <span word="prime">prime</span> <span word="numbers">numbers</span>, <span word="but">but</span> 15 <span word="is">is</span> <span word="not">not</span>, <span word="since">since</span> 15 <span word="has">has</span> <span word="four">four</span> <span word="different">different</span> <span word="positive">positive</span> <span word="divisors">divisors</span>, 1, 3, 5, <span word="and">and</span> 15. <span word="The">The</span> <span word="number">number</span> 1 <span word="is">is</span> <span word="not">not</span> <span word="a">a</span> <span word="prime">prime</span> <span word="number">number</span>, <span word="since">since</span> <span word="it">it</span> <span word="has">has</span> <span word="only">only</span> <span word="one">one</span> <span word="positive">positive</span> <span word="divisor">divisor</span>. <span word="Every">Every</span> <span word="integer">integer</span> <span word="greater">greater</span> <span word="than">than</span> 1 <span word="is">is</span> <span word="either">either</span> <span word="prime">prime</span> <span word="or">or</span> <span word="can">can</span> <span word="be">be</span> <span word="uniquely">uniquely</span> <span word="expressed">expressed</span> <span word="as">as</span> <span word="a">a</span> <span word="product">product</span> <span word="of">of</span> <span word="prime">prime</span> <span word="factors">factors</span>. <span word="For">For</span> <span word="example">example</span>, 14= , 81= , <span word="and">and</span> 484= .</p>
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