题目内容
设f(x)=x(x-1)(x-2)…(x-100),则f′(0)等于( )A.100
B.0
C.100×99×98×…×3×2×1
D.1
解析:f(x)=x[(x-1)(x-2)(x-3)…(x-100)]?
f′(x)=(x-1)(x-2)(x-3)…(x-100)+x·[(x-1)(x-2)(x-3)…(x-100)]′,?
∴f′(0)=(-1)(-2)(-3)…(-100)+0=1×2×3×…×100.故选C.
答案:C
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