1. y=2/x
x=2/yy≠0
所以反函数为y=2/x x≠0
2. y=(3-2x)/(x-1)=-2+1/(x-1)
1/(x-1)=y+2
x-1=1/(y+2)
x=1+1/(y+2)=(y+3)/(y+2)y≠-2
所以反函数为y=(x+3)/(x+2x≠-2