3种SAT数学解题方法
<p> <span word="SAT">SAT</span>数学考试对于中国内地的考生来说相对比较简单，但是并不是每一个人都如此。所以掌握<span word="SAT">SAT</span>数学解题方法就成为了必要的手段。<span word="SAT">SAT</span>数学解题方法可以让更多的人提高<span word="SAT">SAT</span>数学的成绩，下面就是详细内容。</p><p> 1. 在<span word="SAT">SAT</span>数学解题方法中，代入法是最普遍的一个，也是最简单，最有效的一个。</p><p> 例题：<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="two">two</span> <span word="different">different</span> <span word="integers">integers</span> <span word="and">and</span> <span word="the">the</span> <span word="product">product</span> 35<span word="xy">xy</span> <span word="is">is</span> <span word="the">the</span> <span word="square">square</span> <span word="of">of</span> <span word="an">an</span> <span word="integer">integer</span>, <span word="which">which</span> <span word="of">of</span> <span word="the">the</span> <span word="following">following</span> <span word="could">could</span> <span word="be">be</span> <span word="equal">equal</span> <span word="to">to</span> <span word="xy">xy</span>?</p><p> <span word="A">A</span>. 5 <span word="B">B</span>.70 <span word="C">C</span>. 105 <span word="D">D</span>. 140 <span word="E">E</span>. 350</p><p> 解答：将答案依次带入，发现只有<span word="D">D</span>选项35<span word="xy">xy</span>=35140=35354=2。</p><p> 2. 在<span word="SAT">SAT</span>数学解题方法中，特殊值法适用于那些没有固定数字的答案的题目。</p><p> 例题：<span word="xy">xy</span>=<span word="x">x</span>+<span word="y">y</span>. <span word="If">If</span> <span word="y">y</span>2, <span word="what">what</span> <span word="are">are</span> <span word="all">all</span> <span word="possible">possible</span> <span word="values">values</span> <span word="of">of</span> <span word="x">x</span> <span word="that">that</span> <span word="satisfy">satisfy</span> <span word="the">the</span> <span word="equation">equation</span> <span word="above">above</span>?</p><p> <span word="A">A</span>. <span word="x">x</span>0, <span word="B">B</span>. 02</p><p> 解答：<span word="y">y</span>2,不妨假设它为3，3<span word="x">x</span>=<span word="x">x</span>+3,<span word="x">x</span>=3/2, 一目了然<span word="D">D</span>即为正确选项。</p><p> 3. 巧解法在<span word="SAT">SAT</span>数学解题方法中就是一个有一点复杂的了，大家可以练习一下。</p><p> 例题：<span word="At">At</span> <span word="a">a</span> <span word="certain">certain</span> <span word="diner">diner</span>, <span word="Joe">Joe</span> <span word="orders">orders</span> 3 <span word="doughnuts">doughnuts</span> <span word="and">and</span> <span word="a">a</span> <span word="cup">cup</span> <span word="of">of</span> <span word="coffee">coffee</span> <span word="and">and</span> <span word="is">is</span> <span word="charged">charged</span> $2.25. <span word="Stella">Stella</span> <span word="orders">orders</span> 2 <span word="doughnuts">doughnuts</span> <span word="and">and</span> <span word="a">a</span> <span word="cup">cup</span> <span word="of">of</span> <span word="coffee">coffee</span> <span word="and">and</span> <span word="is">is</span> <span word="charged">charged</span> $1.70. <span word="What">What</span> <span word="is">is</span> <span word="the">the</span> <span word="price">price</span> <span word="of">of</span> 2 <span word="doughnuts">doughnuts</span>?</p><p> <span word="A">A</span>. $ 0.55 <span word="B">B</span>. $ 0.60 <span word="C">C</span>. $ 1.10 <span word="D">D</span>. $ 1.30 <span word="E">E</span>. $ 1.80</p>
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