题目内容

f(x)=x(x-1)(x-2)…(x-100),则f′(0)等于(  )

A.100             B.0                C.100!                  D.1

解析:∵f(x)=x(x-1)(x-2)…(x-100),

f′(x)=(x-1)(x-2)…(x-100)+x[(x-1)(x-2)…(x-100)]′.

f′(0)=(-1)×(-2)×…×(-100)

=100×99×98×…×3×2×1.

答案:C

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