新gre数学重要考点:Mode
Mode
The mode of a set of numbers is the number that repeats the most in the set.
Example:
Mode of the set {1,2,3,2,4,5} is 2.
The set of numbers {1,2,4,1,2,3,6,8}has two modes:1 and 2.
Remember:
There can be more than one number with the highest repeat count. In that case all of them with the highest repeat count are modes.
新gre数学重要考点:Dividing Polynomial by Monomial
Dividing Polynomial by Monomial
To divide a polynomial by a monomial, use distributive law to separate the numerator and reduce each term.
Example:
If we divide by 2x, we get /=4x2/-6x/=2x-3.
Remember:
Do not forget to divide all the terms.
If the denominator is a higher order polynimial, do not distribute the denominator.
新gre数学重要考点: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.
新gre数学重要考点:Sequence of Numbers
A sequence is a set of numbers that follow a fixed pattern.The fixed pattern can be expressed by an equation or by a property.
Example:
A set of consecutive integers: 1,2,3,4,5
A set of consecutive even numbers:4,6,8,10,12
A set of consecutive prime: 2,3,5,7,11
A set of consecutive power of 2:4,8,16,32,64
Remember:
A sequence can be in ascending or desceding order.
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。
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