【摘要】 即将参加雅思考试的考生们，考试即将到来，你们的备考工作进行得如何了？考必过为大家精心整理了GRE数学重要知识点：Substitution，希望能够帮助大家通过雅思考试。那么，同学们一起快来做题吧！关于GRE数学重要知识点：Substitution的具体内容如下：
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.
以上就是考必过为大家整理的GRE数学重要知识点：Substitution的具体内容，你全部做对了吗？所谓未来，其实只是过去的堆砌，堆砌昨天便有了今天，堆砌今天便有了明天，堆砌明天便是未来。最后，考必过预祝大家在未来的雅思考试中能够取得优异的成绩！