对于参加GRE考试的考生而言,在备考GRE的过程中需要对常见的错误进行掌握,为了帮助大家更好的掌握新GRE数学考试的常见错误。
新GRE数学常见错误解析,下面将新GRE数学考试中常出现的问题总结出来,帮助大家更好的备考GRE考试。
1. 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,请大家多多在解题时注意总结。
2. 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?
解析:无穷多个,别忘了整数包括负数。
EX9:有300个人,A,B,C是三个俱乐部,分别有180,170,160个人,已知A交B有90,B交C有80,A交C有85,那么问A,B,C都交的人数。
解析:不确定。题目中并不是每一个人都必然会出现在A,B,C三个俱乐部里,所以有人会不在这个范围内而无法计算,所以不能用公式求解。
EX10:上题如果是这样呢:A交B是8,B交C是70,A交C是60,那么问A,B,C都交的有多少人?
解析:注意不再是无法求解了,实际上题目的数字比较特殊,如果代入公式:
I=A+B+C-AB-AC-BC+ABC=300+ABC,由于I=300,所以不可能 有人未参加,所以这时ABC=0。
注:从这里我们要看到:定势思维的害处。
3.计算错误:考试时草稿要打的慢而谨慎,许多考生一心要跨区,所以做的特快,反而在容易题上失分,所以对于数学,尽管简单,但你不可以忽视它。
本文针对GRE考试中数学部分较常出现的错误进行了整理分析,希望能够给大家提供一些帮助,在此预祝大家取得理想的GRE考试成绩。
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