求值域；f{x}=x²-1分之x²-3x+2
问题描述：
求值域；f{x}=x²-1分之x²-3x+2
答
x≠±1
f(x)=(x-1)*(x-2)/[(x+1)*(x-1)]
=(x-2)/(x+1)
=1-[3/(x+1)]
f(x)≠1