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新gre數(shù)學考點：Substitution.

2017/08/09 06:59:40 編輯： 瀏覽次數(shù)：305 移動端

　　今天針對新gre數(shù)學復(fù)習，小編給大家整理的是關(guān)于Substitution的相關(guān)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gre數(shù)學難的困境。

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　　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.

　　俗話說：“工欲善其事必先利其器”。有一部分考生認為新GRE數(shù)學具有一定的難度，這其中的原因是由于考生在復(fù)習時沒有把新gre數(shù)學的基礎(chǔ)打牢。想要新gre數(shù)學考好，復(fù)習的時候一定要把基本概念和重要考點都弄扎實。

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