新GRE数学常见之Term
<p> 2014新<span word="gre">gre</span>考试实施以来，不仅对写作部分茫然不知所措，就连我们所擅长的数学也甚是担忧，相信这其中的原因还是由于考生在新<span word="gre">gre</span>数学复习时没有把基础打牢。如果新版<span word="gre">gre</span>数学基本考点都没有复习到，如何能拿到分数呢?所以说，想要新版<span word="gre">gre</span>数学考好，复习的时候一定要把基本概念和重要考点都弄扎实。</p><p> 今天针对新版<span word="gre">gre</span>数学复习，给大家整理的是关于<span word="Term">Term</span>的相关内容，这些概念在考试中一定会考到的。希望考生能再接再厉，取得一个好成绩，突破新版<span word="gre">gre</span>数学难的困境。</p><p> <span word="Term">Term</span></p><p> <span word="A">A</span> <span word="product">product</span> <span word="of">of</span> <span word="coefficients">coefficients</span> <span word="and">and</span> <span word="any">any</span> <span word="number">number</span> <span word="of">of</span> <span word="variables">variables</span> <span word="with">with</span> <span word="exponents">exponents</span> <span word="is">is</span> <span word="called">called</span> <span word="a">a</span> <span word="term">term</span>.</p><p> <span word="Term">Term</span>s that have the same variables with identical exponents for each variables are called like terms.</p><p> <span word="Example">Example</span>:</p><p> 3<span word="x">x</span>,<span word="axy">axy</span>,4<span word="x">x</span>2<span word="yz">yz</span> <span word="are">are</span> <span word="terms">terms</span>.</p><p> 3<span word="x">x</span>+2 <span word="is">is</span> <span word="not">not</span> <span word="term">term</span>: <span word="it">it</span> <span word="is">is</span> <span word="a">a</span> <span word="sum">sum</span> <span word="of">of</span> <span word="two">two</span> <span word="terms">terms</span>.</p><p> 3<span word="x">x</span>2<span word="y">y</span> <span word="and">and</span> 7<span word="x">x</span>2<span word="y">y</span> <span word="are">are</span> <span word="like">like</span> <span word="terms">terms</span> <span word="since">since</span> <span word="both">both</span> <span word="have">have</span> <span word="the">the</span> <span word="same">same</span> <span word="variables">variables</span> <span word="x">x</span> <span word="and">and</span> <span word="y">y</span> <span word="with">with</span> <span word="identical">identical</span> <span word="exponents">exponents</span>: 2 <span word="for">for</span> <span word="x">x</span> <span word="and">and</span> 1 <span word="for">for</span> <span word="y">y</span>.</p><p> <span word="Remember">Remember</span>:</p><p> <span word="There">There</span> <span word="cannot">cannot</span> <span word="be">be</span> <span word="any">any</span> <span word="addition">addition</span> <span word="or">or</span> <span word="subtraction">subtraction</span> <span word="in">in</span> <span word="a">a</span> <span word="single">single</span> <span word="term">term</span>.</p><p> <span word="Since">Since</span> <span word="multiplication">multiplication</span> <span word="is">is</span> <span word="associative">associative</span>, <span word="rearrangements">rearrangements</span> <span word="of">of</span> <span word="variables">variables</span> <span word="does">does</span> <span word="not">not</span> <span word="change">change</span> <span word="a">a</span> <span word="term">term</span>:3<span word="xy">xy</span> <span word="is">is</span> <span word="same">same</span> <span word="as">as</span> 3<span word="yx">yx</span>.</p><p> 3<span word="x">x</span>2<span word="y">y</span> <span word="and">and</span> 7<span word="xyx">xyx</span> <span word="are">are</span> <span word="like">like</span> <span word="terms">terms</span>.</p>
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