新GRE数学要点:Term

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Term 　　A product of coefficients and any number of variables with exponents is called a term. Terms that have the same variables with identical exponents for each variables are called like terms.
　　Example:
9 _: L1 ?/ g8 ~+ U: Z/ t　　3x,axy,4x2yz are terms. 3x+2 is not term: it is a sum of two terms.
* u/ V  b) P4 M6 y( x* V　　3x2y and 7x2y are like terms since both have the same variables x and y with identical exponents: 2 for x and 1 for y.
8 S0 b- g" N/ Q0 j　　Remember:
! [, r* A0 X3 X' a% \: c　　There cannot be any addition or subtraction in a single term.
8 O! o3 T5 o9 i, t　　Since multiplication is associative, rearrangements of variables does not change a term:3xy is same as 3yx.
　　3x2y and 7xyx are like terms.
　　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。