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5.(全國(guó)II)函數(shù)y=f(x)的圖像與函數(shù)g(x)=log2x(x>0)的圖像關(guān)于原點(diǎn)對(duì)稱(chēng),則f(x)的表達(dá)式為
(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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