求值域(1)y=log2(x) y=log2(2-x)^2 (3)y=log2(x^2-4x+6)(4)y=log1/2(x)(x≥2)(5)y=log1/2((x^2-2x+2)

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求值域(1)y=log2(x) y=log2(2-x)^2 (3)y=log2(x^2-4x+6)(4)y=log1/2(x)(x≥2)(5)y=log1/2((x^2-2x+2)
求值域(1)y=log2(x) y=log2(2-x)^2 (3)y=log2(x^2-4x+6)(4)y=log1/2(x)(x≥2)(5)y=log1/2(
(x^2-2x+2)

求值域(1)y=log2(x) y=log2(2-x)^2 (3)y=log2(x^2-4x+6)(4)y=log1/2(x)(x≥2)(5)y=log1/2((x^2-2x+2)
log以2为底是增函数,你先求出()里面的值域,这样再加log就可以得到整个的值域