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.
$ g; G6 K( l! i　　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:
6 C& _6 [" P2 F' ?　　Monomials can be subtracted only if they have the same variables with identical powers.
& ~; i5 G5 B- S' Q  n　　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。