论文部分内容阅读
我们知道 ,函数 ｙ =ｆ(ｘ)若存在反函数 ,则 ｙ =ｆ(ｘ)与它的反函数 ｙ =ｆ-1(ｘ)有如下性质 :性质 若 ｙ =ｆ-1(ｘ)是函数 ｙ =ｆ(ｘ)的反函数 ,则有ｆ(ａ) =ｂ ｆ-1(ｂ) =ａ .这一性质的几何解释是 ｙ =ｆ(ｘ)与其反函数 ｙ =ｆ-1(ｘ)的图象关于直线 ｙ=ｘ对称 .例 1 函
We know that if there is an inverse function for the function y = f(x), then y = f(x) and its inverse function y = f-1(x) have the following properties: property if y = f-1(x) is The inverse function of the function y = f(x) has f(a) = b f-1(b) = a . The geometrical interpretation of this property is y = f(x) and its inverse function y = f-1 ( The image of x) is symmetrical about the straight line y=x. Example 1 letter