求值域y=(3x+2)÷(1-x)的值域
问题描述:
求值域y=(3x+2)÷(1-x)的值域
答
y=(3x+2)/(1-x) = -(3x-3+5)/(x-1) = -3 - 5/(x-1)
5/(x-1)≠0
-3 - 5/(x-1)≠-3
值域(-∞,-3)U(3,+∞)