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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,对任意的正数a、b,若a>b,则必有( )
A.af(a)<bf(b)
B.bf(a)<af(b)
C.af(b)<bf(a)
D.bf(b)<af(a)
考点分析:
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