f(x)=x(x-1)(x+2)(x-3)(x+4)……(x+100),求f'(1)
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f(x)=x(x-1)(x+2)(x-3)(x+4)……(x+100),求f'(1)
![f(x)=x(x-1)(x+2)(x-3)(x+4)……(x+100),求f'(1)](/uploads/image/z/18392698-10-8.jpg?t=f%28x%29%3Dx%28x-1%29%28x%2B2%29%28x-3%29%28x%2B4%29%E2%80%A6%E2%80%A6%28x%2B100%29%2C%E6%B1%82f%27%281%29)
f'(x)=[x'(x-1)(x+2)(x-3)(x+4).(x+100)]+[x(x-1)'(x+2)(x-3)(x+4).(x+100)]+...+[x(x-1)(x+2)(x-3)(x+4).(x+100)']
除开第2项外,其他各项均含有因式(x-1),当x=1时,这些项均为0
故
f'(1)=x(x-1)'(x+2)(x-3)(x+4).(x+100)|x=1
=1*3*(-2)*5*(-4)*...*(-98)*101
=-101!/100
除开第2项外,其他各项均含有因式(x-1),当x=1时,这些项均为0
故
f'(1)=x(x-1)'(x+2)(x-3)(x+4).(x+100)|x=1
=1*3*(-2)*5*(-4)*...*(-98)*101
=-101!/100
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