新GRE数学要点:Subtracting Monomials

会计考友

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.
( _( I1 H' [: [" [3 E5 R4 c　　Example:
  v, z. s4 b) {+ i　　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:
% ?0 n' O3 p% V& J( _3 k9 C! u　　Monomials can be subtracted only if they have the same variables with identical powers.
　　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。