摘要：5．函数y＝f(x)的图像与函数g(x)＝log2x(x＞0)的图像关于原点对称.则f(x)的表达式为 (A)f(x)＝(x＞0) (B)f(x)＝log2(-x)(x＜0) (C)f(x)＝-log2x(x＞0) (D)f(x)＝-log2(-x)(x＜0)

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