常用GMAT数学公式汇总
<p> （<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="b">b</span>2 （<span word="a">a</span>+<span word="b">b</span>）2=<span word="a">a</span>2+2<span word="ab">ab</span>+<span word="b">b</span>2 （<span word="a">a</span>-<span word="b">b</span>）2=<span word="a">a</span>2-2<span word="ab">ab</span>+<span word="b">b</span>2</p><p> （<span word="a">a</span>+<span word="b">b</span>）3=<span word="a">a</span>3+3<span word="a">a</span>2<span word="b">b</span>+3<span word="ab">ab</span>2+<span word="b">b</span>3 （<span word="a">a</span>-<span word="b">b</span>）3=<span word="a">a</span>3-3<span word="a">a</span>2<span word="b">b</span>+3<span word="ab">ab</span>2-<span word="b">b</span>3</p><p> 一元二次方程<span word="ax">ax</span>2+<span word="bx">bx</span>+<span word="c">c</span>=0的解<span word="x">x</span>？，？=（-<span word="bb">bb</span>2-4<span word="ac">ac</span>）/2<span word="a">a</span></p><p> <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>。</p><p> <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。</p><p> <span word="Discount">Discount</span>=<span word="Cost">Cost</span>？<span word="Rate">Rate</span> <span word="of">of</span> <span word="Discount">Discount</span> <span word="Distance">Distance</span>=<span word="Speed">Speed</span>？<span word="Time">Time</span></p><p> <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。</p><p> 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><p> 平面直角坐标系中，<span word="A">A</span>（<span word="x">x</span>1，<span word="y">y</span>1）和<span word="B">B</span>（<span word="x">x</span>2，<span word="y">y</span>2）是任意两点，<span word="C">C</span>（<span word="x">x</span>，<span word="y">y</span>）是线段<span word="AB">AB</span>的中点，则<span word="x">x</span>=（<span word="x">x</span>1+<span word="x">x</span>2）/2，，<span word="y">y</span>=（<span word="y">y</span>1+<span word="y">y</span>2）/2，线段<span word="AB">AB</span>两端点间的距离=</p><p> 平面图形的周长和面积：</p><p> <span word="Perimeter">Perimeter</span> <span word="Area">Area</span></p><p> <span word="Triangle">Triangle</span> 三边之和 （底高）/2</p><p> <span word="Square">Square</span> 边长4 边长的平方</p><p> <span word="Rectangle">Rectangle</span> （长+宽）2 长宽</p><p> <span word="Parallelogram">Parallelogram</span> （长+宽）2 底高</p><p> <span word="Trapezoid">Trapezoid</span> 四边之和 （上底+下底）高/2</p><p> <span word="Rhombus">Rhombus</span> 边长4 两条对角线之积的1/2</p>
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