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f(x)是定义在(0,+∞)上的非负可导函数,且满足xf′(x)-f(x)<0,...
f(x)是定义在(0,+∞)上的非负可导函数,且满足xf′(x)-f(x)<0,对任意正数a,b,若a<b,则必有( )
A.af(b)<bf(a)
B.bf(a)<af(b)
C.af(a)<bf(b)
D.bf(b)<af(a)
考点分析:
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B.f(x)的图象关于点(
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C.把f(x)的图象向左平移
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D.f(x)的最小正周期为π,且在[0,
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D.
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