俗話說：“工欲善其事必先利其器”。很多參加了新版gre考試的同學都覺得數(shù)學有點難度，相信這其中的原因還是由于考生在新版gre數(shù)學復習時沒有把基礎打牢。如果新版gre數(shù)學基本考點都沒有復習到，如何能拿到分數(shù)呢?所以說，想要新版gre數(shù)學考好，復習的時候一定要把基本概念和重要考點都弄扎實。
今天針對新版gre數(shù)學復習，小編給大家整理的是關于Substitution的相關內(nèi)容，這些概念在考試中一定會考到的。希望考生能再接再厲，取得一個好成績，突破新版gre數(shù)學難的困境。
新版gre數(shù)學復習重要考點：Substitution
Substitution is a method where one or more variables in an expression is replaced by numbers or another set of variables.To evaluate an expression specific numbers are used as substitute. To express in terms of another set of variables, variables are replaced by the new set of variables.
Example:
If x=3, then 2x2+4x+1 can be evaluated by substituting 3 for x.
Replacing all x by 3, we get 2*32+4*3+1=31.
If x=2+y, then x2-3 can be expressed in terms of y by replacing all x by (2+y):(2+y)2-3=y2+4y+1.
Remember:
Do not forget to replace all occurrences of the variable.
After substitution the variable does not appear anywhere in the expression.
很多新版gre數(shù)學復習考點都是高中時候?qū)W到的知識點，考生不要過于緊張，把基本概念弄明白，再記住一些新版gre數(shù)學必備的詞匯，那么相信新版gre數(shù)學應該沒有問題。