1.求y=3^(x-1)-2 (x1)值域 2.求y=log1/2(x^2-4x+5)值域 3.y=0(x>=0);y=

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1.求y=3^(x-1)-2 (x1)值域 2.求y=log1/2(x^2-4x+5)值域 3.y=0(x>=0);y=x (x

1 x1 (1,+无穷)
2.x^2-4x+5=(x-2)^2+1>=1
值域为(-无穷,0]
3.y=0(x>=0)
值域恒为0
y=x(x

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