GMAT数学复习：不可忽视的真相
<p> <span word="GMAT">GMAT</span>数学复习过程中，很多考生可能会把更多精力投放在<span word="GMAT">GMAT</span>数学解题技巧上，却把<span word="GMAT">GMAT</span>数学的一个最重要方面给忽视了，那就是<span word="GMAT">GMAT</span>数学的基本概念，基本概念是解题的基础，基础没有打牢，积累了再多的<span word="GMAT">GMAT</span>数学解题技巧，也是聋子的耳朵摆设。</p><p> 1.<span word="mode">mode</span></p><p> 一堆数中出现频率最高的一个或几个数</p><p> 2.<span word="range">range</span></p><p> 一堆数中最大和最小数之差</p><p> 3.<span word="mean">mean</span></p><p> <span word="arithmatic">arithmatic</span> <span word="mean">mean</span></p><p> <span word="geometric">geometric</span> <span word="mean">mean</span> <span word="n">n</span>个数之积的<span word="n">n</span>次方根</p><p> 4.<span word="median">median</span></p><p> 将一堆数排序之后，正中间的一个数， 或者中间两个数的平均数/2=6 )</p><p> 5.<span word="standard">standard</span> <span word="error">error</span></p><p> 一堆数中，每个数与平均数的差的绝对值之和，除以这堆数的个数<span word="e">e</span>.<span word="g">g</span>. <span word="standard">standard</span> <span word="error">error</span> <span word="of">of</span> 0,2,5,7,6 <span word="is">is</span>: /5=2.4 )</p><p> 6.<span word="standard">standard</span> <span word="variation">variation</span></p><p> 一堆数中，每个数与平均数之差的平方之和，再除以<span word="ne">ne</span>.<span word="g">g</span>. <span word="standard">standard</span> <span word="variation">variation</span> <span word="of">of</span> 0,2,5,7,6 <span word="is">is</span>:_ 2 2 2 2 2__ ++++_/5=6.8</p><p> 7.<span word="standard">standard</span> <span word="deviation">deviation</span></p><p> 就是<span word="standard">standard</span> <span word="variation">variation</span>的平方根</p><p> 标准方差的公式：<span word="d">d</span>^2=/<span word="n">n</span></p><p> <span word="d">d</span> 为标准方差</p><p> 8. 三角形 余玄定理<span word="c">c</span>^2=<span word="a">a</span>^2+<span word="b">b</span>^2-2<span word="abcost">abcost</span> <span word="t">t</span>为<span word="ab">ab</span>两条线间的夹角</p>
页:
[1]