俗话说:工欲善其事必先利其器。很多参加了新版gre考试的同学都觉得数学有点难度,相信这其中的原因还是由于考生在新版gre数学复习时没有把基础打牢。如果新版gre数学基本考点都没有复习到,如何能拿到分数呢?所以说,想要新版gre数学考好,复习的时候一定要把基本概念和重要考点都弄扎实。
所以,从今天起,针对新版gre数学复习,小编每天给考生整理一个重要考点,这些概念在考试中一定会考到的。希望考生能再接再厉,取得一个好成绩,突破新版gre数学难的困境。
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.
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