GRE数学考试的易错点。GRE数学题和中国学生平时参加的数学考试是截然不同的,如果考生对题目的英文表达不理解,那肯定会对做题产生障碍,所以参加GRE考试的考生了解GRE数学考试常常出错的地方,对自己的GRE备考是十分有利的。
1.GRE数学考试错误之英文表达:
EX3:On a certain number line, if -7 is a distance 4from n and 7 is a distance of 18 from n, then n=
解析:前半个表达是4是-7到n的distance,后面半个表达是18是7到11的distance,所以from后面的是起点,列出式子:-7- n=4, 7-n=18,两个都解出来n=-11。注意体会表达,a distance 4=a distance of 4。
EX4:A is as twice the price as B
解析:上式代表A=2B。类似的表达很容易理解错误,请大家多多在GRE考试解题时注意总结。
2. GRE数学题错误之错误理解:
在概率问题中只有独立事件才可以用P=PP,比如下面:
EX5:The probability of the occurrence of matter A is 0.6 while that of matter B is 0.7, what s the probability of the coincidence of A and B
解析:A和B是否为独立事件,不知道,所以无法判断。
EX6:如果上题问A和B都不发生的概率呢?
解析:A不发生的概率是0.4,B是0.3,所以他们的交集是0.3,所以答案应该是0.3。
EX7:如果我告诉你上面的A和B成功发生的概率都是他们各自独立的,那么还是问AB一起成功的概率?
解析:答案还是不确定。因为A和B虽然独立,但是他们加起来是否相互影响,是促进还是遏制,不清楚,所以答案不是大家理想的0.42.
EX8:小于100的整数中有多少可被6整除?
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