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若曲线y=f(x)在点(x,f(x))处的切线方程为y=2x-1,则( ) A....
若曲线y=f(x)在点(x,f(x))处的切线方程为y=2x-1,则( )
A.f′(x)=0
B.f′(x)>0
C.f′(x)<0
D.f′(x)不存在
考点分析:
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