函数ｙ＝ｆ－１（ｘ）与ｙ＝ｆ（ｘ）的图像关于直线ｙ＝ｘ对称，这是学生都非常熟悉的一个性质，但对它们之间的其它性质却知之不详，或者知而不会用．本文试图通过实例来阐明它们的用法．函数ｙ＝ｆ－１（ｘ）与ｙ＝ｆ（ｘ）性质间的关系如下：１．定义域和值域的互换性．函 The image of the function y=f-1(x) and y=f(x) is symmetric about the line y=x. This is a property that students are very familiar with, but the other properties between them are unknown or known. Not use. This article attempts to clarify their usage through examples. The relationship between the functions y=f-1(x) and y=f(x) is as follows: 1. Define the interchangeability of domains and value domains. letter