Question

已知x=1+y分之1+2y,把它改写成y=f(x)的形式

Answer 1

x=(1+2y)/(1+y)

令t=1+y,则y=t-1

x=(2t-1)/t

x=2-1/t

1/t=2-x

t=1/(2-x)

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