f(x)=x+3/x-2 f(x+1)=x+4/x-1g(x)与函数f(x+1)互为反函数设g(x)=yy*（x-1）=x+4xy-x=y+4x=(y+4)/(y-1)g(x)=(x+4)/(x-1)g(11)=3/2
