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2017年如何复习新GRE数学考试

刚刚更新 编辑: 美国 浏览次数:235 移动端

  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。

  今天针对新版GRE数学复习,小编给大家整理的是关于平均数的相关内容,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:AP

  Average of n numbers of arithmetic proGREssion (AP) is the average of the smallest and the largest number of them. The average of m number can also be written as x + d(m-1)/2.

  Example:

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

  The average of all odd numbers from 3 to 3135 is (3+3135)/2=1569

  The average of all multiples of 7 from 14 to 126 is (14+126)/2=70

  remember:

  Make sure no number is missing in the middle.

  With more numbers, average of an ascending AP increases.

  With more numbers, average of a descending AP decreases.

  AP:numbers from sum

  given the sum s of m numbers of an AP with constant increment d, the numbers in the set can be calculated as follows:

  the first number x = s/m - d(m-1)/2,and the n-th number is s/m + d(2n-m-1)/2.

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