GMAT数学要记牢的公式
<p> 在<span word="GMAT">GMAT</span>数学答题中，我们往往要用到一些简单的<span word="GMAT">GMAT</span>数学公式，整理了一些<span word="GMAT">GMAT</span>数学公式。 (<span word="a">a</span>+<span word="b">b</span>)(<span word="a">a</span>-<span word="b">b</span>)=<span word="a">a</span>-<span word="b">b</span> (<span word="a">a</span>+<span word="b">b</span>)=<span word="a">a</span>+2<span word="ab">ab</span>+<span word="b">b</span> (<span word="a">a</span>-<span word="b">b</span>)=<span word="a">a</span>-2<span word="ab">ab</span>+<span word="b">b</span> (<span word="a">a</span>+<span word="b">b</span>)=<span word="a">a</span>+3<span word="ab">ab</span>+3<span word="ab">ab</span>+<span word="b">b</span> (<span word="a">a</span>-<span word="b">b</span>)=<span word="a">a</span>-3<span word="ab">ab</span>+3<span word="ab">ab</span>-<span word="b">b</span> 一元二次方程<span word="ax">ax</span>+<span word="bx">bx</span>+<span word="c">c</span>=0的解<span word="x">x</span>,=(-<span word="bb">bb</span>-4<span word="ac">ac</span>)/2<span word="a">a</span> *<span word="Simple">Simple</span> <span word="Interest">Interest</span>:利息<span word="Interest">Interest</span>=本金<span word="Principal">Principal</span>时间<span word="Time">Time</span>利率<span word="Rate">Rate</span>。 *<span word="Compound">Compound</span> <span word="Interest">Interest</span>:<span word="A">A</span>=(1+<span word="R">R</span>)<span word="n">n</span>;<span word="A">A</span>为本利和，<span word="P">P</span>为本金,<span word="R">R</span>为利率,<span word="n">n</span>为期数。 *<span word="Discount">Discount</span>=<span word="CostRate">CostRate</span> <span word="of">of</span> <span word="Discount">Discount</span> *<span word="Distance">Distance</span>=<span word="SpeedTime">SpeedTime</span> *<span word="Pythagorean">Pythagorean</span> <span word="Theorem">Theorem</span>(勾股定理):直角三角形(<span word="right">right</span> <span word="triangle">triangle</span>)两直角边(<span word="legs">legs</span>)的平方和等于斜边 (<span word="hypotenuse">hypotenuse</span>)的平方。 *多变形的内角和：(<span word="n">n</span>-2)180，总对角线数为<span word="n">n</span>(<span word="n">n</span>-3)/2条，从每一个顶点引出的对角线数为(<span word="n">n</span>-3)条;式中：<span word="n">n</span>为多边形的边数</p>
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