Question

如何求分子分母都带都有未知数的反函数如（x-1)/(x+1)请详细说明

Answer 1

y=(x-1)/(x+1)

y(x+1)=(x-1)

xy+y=x-1

x(y-1)=-y-1

x=(1+y)/(1-y)

反函数：y=(1+x)/(1-x)