下列四類函數(shù)中,個有性質(zhì)“對任意的x>0,y>0,函數(shù)fx)滿足fxy)=fxfy)”的是            (    )

    A.冪函數(shù)           B.對數(shù)函數(shù)         C.指數(shù)函數(shù) D.余弦函數(shù)

 

【答案】

C

【解析】略

 

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