在备考GMAT数学过程,经常会遇到一些GMAT数学难题。由于解题思路以及方法使用不当,往往会导致所谓的难题耽误大量时间,从而影响GMAT数学复习效果。针对这个问题,小编特分享如何解GMAT数学难题,希望可以帮到各位。文中观点仅供参考。
学生总数240,学SCIENCE的是140,学MATH的170,求LEARN MATH BUT NOT SCIENCE的人数?
1)THERE ARE 55 STUDENTS WHO LEARN SCIENCE BUT NOT MATH
2)30 DIDNT SELECT ANY SUBJECT
这种题有两种解题方法,
1、画图法
画两个相交的圆A、B。圆A下写学甲科的总数,圆B下写学乙科的总数;两圆相交的部分写两科都学的数量,不相交的部分写各自只学一门的数量。再在外面画一个大方框,是学生总数,圆外方框内是什么都不学的。这样就一目了然了。
2、概念法
P=P P-P
以本题为例,至少学一科的=只学甲科 只学乙科-两科都学
全集=A+B-A交B+非A非B
normal distribution下One standard deviation away from the mean的possibility为68%,Two standard deviation away from the mean的possibility为95%,standard deviation = 10。一种cougar的体长呈正态分布,均值60英寸,问体长在70到80英寸之间的概率?
落在平均值标准方差内的概率
possibility = X
60-10
60-102
只落在一边的概率就要除以二,基本上这种题画一条数轴,做几个点会更一目了然一些。
/2 = 13.5
以上就是小编为大家整理的如何解GMAT数学难题,文中采用了两种方法,一个是作图法,一个是概念法。个人还是感觉作图法比较形象,当然这完全根据个人习惯,考生可自行选择最后祝大家都能考出好成绩。
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