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若f(x)=x2-2x-4lnx,则f′(x)>0的解集为( ) A.(0,+∞...
若f(x)=x2-2x-4lnx,则f′(x)>0的解集为( )
A.(0,+∞)
B.(-1,0)∪(2,+∞)
C.(2,+∞)
D.(-1,0)
考点分析:
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