英文版GRE数学考试重要考点（1）
<p> 新<span word="gre">gre</span>数学重要考点：<span word="Mode">Mode</span></p><p> <span word="Mode">Mode</span></p><p> <span word="The">The</span> <span word="mode">mode</span> <span word="of">of</span> <span word="a">a</span> <span word="set">set</span> <span word="of">of</span> <span word="numbers">numbers</span> <span word="is">is</span> <span word="the">the</span> <span word="number">number</span> <span word="that">that</span> <span word="repeats">repeats</span> <span word="the">the</span> <span word="most">most</span> <span word="in">in</span> <span word="the">the</span> <span word="set">set</span>.</p><p> <span word="Example">Example</span>:</p><p> <span word="Mode">Mode</span> of the set {1,2,3,2,4,5} is 2.</p><p> <span word="The">The</span> <span word="set">set</span> <span word="of">of</span> <span word="numbers">numbers</span> {1,2,4,1,2,3,6,8}<span word="has">has</span> <span word="two">two</span> <span word="modes">modes</span>:1 <span word="and">and</span> 2.</p><p> <span word="Remember">Remember</span>:</p><p> <span word="There">There</span> <span word="can">can</span> <span word="be">be</span> <span word="more">more</span> <span word="than">than</span> <span word="one">one</span> <span word="number">number</span> <span word="with">with</span> <span word="the">the</span> <span word="highest">highest</span> <span word="repeat">repeat</span> <span word="count">count</span>. <span word="In">In</span> <span word="that">that</span> <span word="case">case</span> <span word="all">all</span> <span word="of">of</span> <span word="them">them</span> <span word="with">with</span> <span word="the">the</span> <span word="highest">highest</span> <span word="repeat">repeat</span> <span word="count">count</span> <span word="are">are</span> <span word="modes">modes</span>.</p><p> 新<span word="gre">gre</span>数学重要考点：<span word="Dividing">Dividing</span> <span word="Polynomial">Polynomial</span> <span word="by">by</span> <span word="Monomial">Monomial</span></p><p> <span word="Dividing">Dividing</span> <span word="Polynomial">Polynomial</span> <span word="by">by</span> <span word="Monomial">Monomial</span></p><p> <span word="To">To</span> <span word="divide">divide</span> <span word="a">a</span> <span word="polynomial">polynomial</span> <span word="by">by</span> <span word="a">a</span> <span word="monomial">monomial</span>, <span word="use">use</span> <span word="distributive">distributive</span> <span word="law">law</span> <span word="to">to</span> <span word="separate">separate</span> <span word="the">the</span> <span word="numerator">numerator</span> <span word="and">and</span> <span word="reduce">reduce</span> <span word="each">each</span> <span word="term">term</span>.</p><p> <span word="Example">Example</span>:</p><p> <span word="If">If</span> <span word="we">we</span> <span word="divide">divide</span> <span word="by">by</span> 2<span word="x">x</span>, <span word="we">we</span> <span word="get">get</span> /=4<span word="x">x</span>2/-6<span word="x">x</span>/=2<span word="x">x</span>-3.</p><p> <span word="Remember">Remember</span>:</p><p> <span word="Do">Do</span> <span word="not">not</span> <span word="forget">forget</span> <span word="to">to</span> <span word="divide">divide</span> <span word="all">all</span> <span word="the">the</span> <span word="terms">terms</span>.</p><p> <span word="If">If</span> <span word="the">the</span> <span word="denominator">denominator</span> <span word="is">is</span> <span word="a">a</span> <span word="higher">higher</span> <span word="order">order</span> <span word="polynimial">polynimial</span>, <span word="do">do</span> <span word="not">not</span> <span word="distribute">distribute</span> <span word="the">the</span> <span word="denominator">denominator</span>.</p><p> 新<span word="gre">gre</span>数学重要考点：<span word="Sum">Sum</span> <span word="of">of</span> <span word="Arithmetic">Arithmetic</span> <span word="Progression">Progression</span></p><p> <span word="The">The</span> <span word="sum">sum</span> <span word="of">of</span> <span word="n">n</span>-<span word="numbers">numbers</span> <span word="of">of</span> <span word="an">an</span> <span word="arithmetic">arithmetic</span> <span word="progression">progression</span> <span word="is">is</span> <span word="given">given</span> <span word="by">by</span></p><p> <span word="S">S</span>=<span word="nxdn">nxdn</span>/2</p><p> <span word="where">where</span> <span word="x">x</span> <span word="is">is</span> <span word="the">the</span> <span word="first">first</span> <span word="number">number</span> <span word="and">and</span> <span word="d">d</span> <span word="is">is</span> <span word="the">the</span> <span word="constant">constant</span> <span word="increment">increment</span>.</p><p> <span word="example">example</span>:</p><p> <span word="sum">sum</span> <span word="of">of</span> <span word="first">first</span> 10 <span word="positive">positive</span> <span word="odd">odd</span> <span word="numbers">numbers</span>:101+2109/2=10+90=100</p>
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