下列四類函數(shù)中,個(gè)有性質(zhì)“對(duì)任意的x>0,y>0,函數(shù)f(x)滿足fxy)=fx

fy)”的是                                                                                                                   [  ]

       (A)冪函數(shù)               (B)對(duì)數(shù)函數(shù)            (C)指數(shù)函數(shù)            (D)余弦函數(shù)

       解    在△ADC中,AD=10,AC=14,DC=6,

       由余弦定理得cos=,

       ADC=120°, ADB=60°

       在△ABD中,AD=10, B=45°, ADB=60°,

       由正弦定理得,

       AB=.

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