英文版GRE数学考试重要考点（2）
<p> 新<span word="gre">gre</span>数学重要考点：<span word="Multiplying">Multiplying</span> <span word="Polynomials">Polynomials</span></p><p> <span word="Multiplying">Multiplying</span> <span word="Polynomials">Polynomials</span></p><p> <span word="To">To</span> <span word="multiply">multiply</span> <span word="two">two</span> <span word="polynomials">polynomials</span>, <span word="open">open</span> <span word="up">up</span> <span word="the">the</span> <span word="first">first</span> <span word="polynomial">polynomial</span> <span word="and">and</span> <span word="multiply">multiply</span> <span word="the">the</span> <span word="second">second</span> <span word="polynomial">polynomial</span> <span word="with">with</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="multiply">multiply</span> <span word="and">and</span> ,<span word="we">we</span> <span word="get">get</span> =3<span word="x">x</span>+2=12<span word="x">x</span>3-3<span word="x">x</span>2+3<span word="x">x</span>+8<span word="x">x</span>2-2<span word="x">x</span>+4=12<span word="x">x</span>3+<span word="x">x</span>2+<span word="x">x</span>+4=12<span word="x">x</span>3+5<span word="x">x</span>2+<span word="x">x</span>+4.</p><p> <span word="Remember">Remember</span>:</p><p> <span word="Do">Do</span> <span word="not">not</span> <span word="froget">froget</span> <span word="to">to</span> <span word="multiply">multiply</span> <span word="all">all</span> <span word="the">the</span> <span word="terms">terms</span>.</p><p> <span word="Repeat">Repeat</span> <span word="distributive">distributive</span> <span word="law">law</span> <span word="when">when</span> <span word="multiplying">multiplying</span> <span word="polynomials">polynomials</span>.</p><p> 新<span word="gre">gre</span>数学重要考点：<span word="Subtracting">Subtracting</span> <span word="Polynomials">Polynomials</span></p><p> <span word="Subtracting">Subtracting</span> <span word="Polynomials">Polynomials</span></p><p> <span word="To">To</span> <span word="subtract">subtract</span> <span word="polynomial">polynomial</span> <span word="from">from</span> <span word="another">another</span>, <span word="subtract">subtract</span> <span word="the">the</span> <span word="like">like</span> <span word="terms">terms</span>. <span word="Like">Like</span> <span word="terms">terms</span> <span word="are">are</span> <span word="those">those</span> <span word="with">with</span> <span word="the">the</span> <span word="same">same</span> <span word="variable">variable</span> <span word="and">and</span> <span word="identical">identical</span> <span word="power">power</span>.</p><p> <span word="Example">Example</span>:</p><p> <span word="By">By</span> <span word="subtracting">subtracting</span> <span word="from">from</span> ,<span word="we">we</span> <span word="get">get</span> 4<span word="x">x</span>2+<span word="x">x</span>+=4<span word="x">x</span>2-4<span word="x">x</span>.</p><p> <span word="Remember">Remember</span>:</p><p> <span word="Only">Only</span> <span word="subtract">subtract</span> <span word="the">the</span> <span word="like">like</span> <span word="terms">terms</span>.</p><p> 新<span word="gre">gre</span>数学重要考点：<span word="Adding">Adding</span> <span word="Polynomials">Polynomials</span></p><p> <span word="Adding">Adding</span> <span word="Polynomials">Polynomials</span></p><p> <span word="To">To</span> <span word="add">add</span> <span word="two">two</span> <span word="polynomials">polynomials</span>, <span word="add">add</span> <span word="the">the</span> <span word="like">like</span> <span word="terms">terms</span>. <span word="Like">Like</span> <span word="terms">terms</span> <span word="are">are</span> <span word="those">those</span> <span word="with">with</span> <span word="the">the</span> <span word="same">same</span> <span word="variables">variables</span> <span word="and">and</span> <span word="identical">identical</span> <span word="powers">powers</span>.</p><p> <span word="Example">Example</span>:</p><p> <span word="By">By</span> <span word="adding">adding</span> <span word="and">and</span> , <span word="we">we</span> <span word="get">get</span> 4<span word="x">x</span>2++=4<span word="x">x</span>2+2<span word="x">x</span>+4.</p><p> <span word="Remember">Remember</span>:</p><p> <span word="Only">Only</span> <span word="add">add</span> <span word="the">the</span> <span word="like">like</span> <span word="terms">terms</span>.</p><p> 新<span word="gre">gre</span>数学重要考点：<span word="Polynomials">Polynomials</span></p>
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