2013年英文版GRE数学考试重要考点(2)

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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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