最新gre考试数学知识及例题解答
<p> 以下是<span word="gre">gre</span>考试数学中经常考察的内容，这些知识点都是最为基础的，只有<span word="gre">gre</span>考生把这些知识点弄明白才能运用到考题当中。下面就给大家介绍一下最新<span word="gre">gre</span>考试数学知识和一些例题、练习题的解答过程。</p><p> 代数和几何部分知识点</p><p> 1.正整数<span word="n">n</span>有奇数个因子,则<span word="n">n</span>为完全平方数</p><p> 2.因子个数求解公式:将整数<span word="n">n</span>分解为质因子乘积形式,然后将每个质因子的幂分别加一相乘.<span word="n">n</span>=<span word="aaabbc">aaabbc</span>则因子个数=</p><p> <span word="eg">eg</span>. 200=222 55 因子个数==12个</p><p> 3.能被8整除的数后三位的和能被8整除;能被9整除的数各位数的和能被9整除.能被3整除的数,各位的和能被3整除.</p><p> 4.多边形内角和=<span word="x">x</span>180</p><p> 5.菱形面积=1/2 <span word="x">x</span> 对角线乘积</p><p> 6.欧拉公式： 边数=面数+顶点数-2</p><p> 8.三角形余玄定理</p><p> <span word="C">C</span>2=<span word="A">A</span>2+<span word="B">B</span>2-2<span word="ABCOS">ABCOS</span>,为<span word="AB">AB</span>两条线间的夹角</p><p> 9.正弦定理:<span word="A">A</span>/<span word="SinA">SinA</span>=<span word="B">B</span>/<span word="SinB">SinB</span>=<span word="C">C</span>/<span word="SinC">SinC</span>=2<span word="R">R</span></p><p> 10.<span word="Y">Y</span>=<span word="k">k</span>1<span word="X">X</span>+<span word="B">B</span>1,<span word="Y">Y</span>=<span word="k">k</span>2<span word="X">X</span>+<span word="B">B</span>2，两线垂直的条件为<span word="K">K</span>1<span word="K">K</span>2=-1</p><p> 11.<span word="N">N</span>的阶乘公式:</p><p> <span word="N">N</span>!=123....<span word="N">N</span> 且规定0!=1 1!=1</p><p> <span word="Eg">Eg</span>:8!=12345678</p><p> 12. 熟悉一下根号2、3、5的值</p><p> <span word="sqrt">sqrt</span>=1.414 <span word="sqrt">sqrt</span>=1.732 <span word="sqrt">sqrt</span>=2.236</p>
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