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新gre数学重要考点：Multiplying Monomials
Multiplying Monomials
To multiply two monomials, multiply the coefficients and add the power of the variables.
By multiplying 3x and 4x, we get (4*3)x∧(1+1)=12x2.
By multiply 3x and 4y, we get (4*3)xy=12xy.
Remember:
Do not forget to add the powers of the same variable.
The terms need not be like terms to be multiplied.
新gre数学重要考点：Subtracting Monomials
Subtracting Monomials
To subtract a monomial from another of the same variables just subtract the coefficients. Only two like monomials can be subtracted from each other.
Example:
By subtracting 3x from 4x, we get (4-3)x=x.
By subtracting 3xy from 2xy, we get (2-3)xy=-xy.
By subtracting bx from ax, we get ax-bx=(a-b)x.
Remember:
Monomials can be subtracted only if they have the same variables with identical powers.
新gre数学重要考点：Adding Monomials
Adding Monomials
To add two monomials of the same variables just add the coefficients.
Only two like monomials can be added together.
Example:
By adding 3x and 4x, we get (3+4)x=7x.
By adding 3xy+2xy, we get (3+2)xy=5xy.
By adding as and bx, we get ax+bx=(a+b)x.
Remember:
Monomials can be added only if they have the same variables with identical powers.
新gre数学重要考点：Monomials
Monomials
An expression with only one term is called monomial.
Example:
3x,2x2,and 4xy are all monomials.
2x+1,x+y,3(x+1),and x+x2 are not monomials.
Remember:
There is no addition or subtraction in monomials.
Mono means one, as in monologue.
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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