反函数是高中数学函数中非常重要的概念,学习反函数要注意两个方面,一方面是正确利用定义去判断一个函数是否存在反函数,另一方面是正确求出一个函数的反函数,分三步进行,即一解(解出x)、二换(互换x,y)、三 The inverse function is a very important concept in high school mathematics function. Learning the inverse function should pay attention to two aspects. On the one hand, it is the correct use of the definition to judge whether a function has an inverse function, on the other hand, Three steps, namely a solution (solution x), two for (swap x, y), three