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换元是一种变量代换,其实质是用一种变量形式去取代另一种变量形式,从而把一个函数变为简单函数.本文对用代数换元法和三角换元法求三类无理函数的值域作些探讨.一、形如"
Substitution is a variable substitution, its essence is to replace one variable with another form of variables, so that a function becomes a simple function.This paper algebraic substitution method and trigonometry for three types of irrational Function of the range for some discussion.