GRE必备之新GRE数学考试重点介绍

自从新GRE改革以来，新GRE考试无论是在写作、语文上还是数学上都有了很大的变化，以下便是新GRE数学考试重点介绍。

新版GRE数学复习重要考点:Sum of Arithmetic ProGREssion

The sum of n-numbers of an arithmetic proGREssion is given by

S=nxdn/2

where x is the first number and d is the constant increment.

example:

sum of first 10 positive odd numbers:101+2109/2=10+90=100

sum of first 10 multiples of 7 starting at 7: 107+7109/2=70+315=385

remember:

For a descending AP the constant difference is negative.

由于美国数学基础教育的难度增加导致数学考试越来越难，但新GRE数学复习考点都是高中时候学到的知识点，考生不要过于紧张，把基本概念弄明白，再记住一些新版GRE数学必备的词汇，那么相信新版GRE数学应该没有问题。

AP

Average of n numbers of arithmetic proGREssion is the average of the

smallest and the

largest number of them. The average of m number can also be written as

x + d/2.

Example:

The average of all integers from 1 to 5 is /2=3