Question

f(x)=x-1分之2x+3的反函数是什么

Answer 1

y = （2x+3） / (x-1)

= (2x - 2 + 5 ) / (x-1)

= 2 + 5/(x-1)

y-2 = 5 /(x-1)

x-1 = 5 / (y-2)

x = 1 + 5/ (y-2)

所以 反函数为 y = 1+ 5/ (x-2)