设f(x)是可导函数,Δx是自变量在点x处的增量,则(  )。A.2f′(x)f

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问题 设f(x)是可导函数,Δx是自变量在点x处的增量,则(  )。A.2f′(x)f(x)B.f′(x)f(x)C.f′(x)f^2(x)D.(f′(x))^2f(x)

选项 A.2f′(x)f(x)
B.f′(x)f(x)
C.f′(x)f^2(x)
D.(f′(x))^2f(x)

答案 A

解析
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