反函数是中学数学中的一个重要内容 ,学习反函数时 ,如果对概念与定义内涵、性质的理解不深刻或有偏差 ,就会造成是非不清、知识错位 .下面以问答形式进行剖析 .1　函数ｘ =ｆ- 1( ｙ)和函数 ｙ =ｆ- 1(ｘ)是同一个函数 ,还是两个不同的函数 ?答 :是同一个函数 .因为函数定义域 Inverse function is an important content in middle school mathematics. When learning the inverse function, if the understanding of concept and definition content and nature is not profound or biased, it will cause confusion and misplaced knowledge. The following analysis in the form of question and answer.1 Is the function x = f - 1( y) and the function y = f - 1(x) the same function, or are they two different functions? A: It is the same function. Because the function defines the domain