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
The average of all odd numbers from 3 to 3135 is /2=1569
The average of all multiples of 7 from 14 to 126 is /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/2,and the n-th number is s/m + d/2.
Example:
if the sum of 7 consecutive even numbers is 70, then the first number
x = 70/7 - 2/2 = 10 - 6 = 4.
the last number is 70/7+2/2=10+6=16.the set is the even
numbers from 4 to 16.
Remember:
given the first number x, it is easy to calculate other numbers using the formula
for n-th number: x+
AP:numbers from average
all m numbers of an AP can be calculated from the average. the first number
x = c-d/2, and the n-th number is c+d/2, where c is the
average of m numbers.
Example:
if the average of 15 consecutive integers is 20,
then the first number x=20-1/2=20-7=13 and
the last number is 20+1/2=20+7=27.
if the average of 33 consecutive odd numbers is 67,
then the first number x=67-2/2=67-32=35 and the
last number is 67+2/2=67+32=99.
Remember: 分页标题#e#
sum of the m numbers is cm,where c is the average.
以上便是新GRE数学考试重点介绍,各位考生可以根据自己的情况参考复习,预祝各位考生考试成功。
2014年雅思阅读备考策略(丁岳)
着眼雅思阅读中的常见关系词 把握雅思阅读技巧
如何做好雅思填空题?
雅思考试六个月备考计划--适合基础较差的烤鸭
一个月时间如何提升雅思阅读成绩?
雅思阅读的猜词技巧
解读雅思考试阅读中的对应关系
如何抓取雅思阅读中的定位词
雅思阅读答题时的注意事项有哪些?
雅思阅读机经的使用方法
雅思阅读真经介绍
巧妙选择雅思阅读判断词
雅思阅读的最高境界:摆脱单词的束缚
雅思阅读配对题和多重选择题的答题策略
怎样做好雅思阅读简答题
雅思考试三个月备考计划--适合基础一般的烤鸭
雅思阅读提高方法有哪些
9个中英互译的雅思阅读长难句
雅思阅读背景知识介绍:数字13为什么不吉利
剖析雅思阅读Heading题的段落结构
雅思阅读成绩提高方法三步走
你知道雅思阅读备考的潜规则吗?
雅思阅读备考误区
雅思难点应对策略
解析雅思阅读中多选题中的同题异做的解题方法
如何做雅思阅读段落细节配对题?
雅思一个月复习备考计划--适合基础较好的烤鸭
雅思阅读中常见的省略句形式
雅思阅读答题技巧
提升雅思阅读实力应着眼四个方面
不限 |
英语教案 |
英语课件 |
英语试题 |
不限 |
不限 |
上册 |
下册 |
不限 |