GRE必備之新GRE數學考試重點介紹
自從新GRE改革以來，新GRE考試無論是在寫作、語文上還是數學上都有了很大的變化，以下便是新GRE數學考試重點介紹。
新版GRE數學復習重要考點: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.
由于美國數學基礎教育的難度增加導致數學考試越來越難，但新GRE數學復習考點都是高中時候學到的知識點，考生不要過于緊張，把基本概念弄明白，再記住一些新版GRE數學必備的詞匯，那么相信新版GRE數學應該沒有問題。
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
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