函数是高中数学的主干,反函数又是函数的重要组成部分,所以学习好反函数很重要．解决反函数的相关问题时,经常用到如下结论: 函数与其反函数的定义域与值域互换; 函数与其反函数的图象关于直线y=x对称; Functions are the backbone of high school mathematics. Inverse functions are an important part of the function. Therefore, it is very important to learn the inverse functions. When solving problems related to inverse functions, the following conclusions are frequently used: The domain and value domain of the function and its inverse function are interchanged; The image of the function and its inverse function is symmetric about the straight line y=x;