求解这个求导怎么求?
设f(x)=x(x+1)(x+2)...(x+n)(x>=2),则f'(0)=_______?感谢!!...
设f(x)=x(x+1)(x+2)...(x+n)(x>=2),则f'(0)=_______?
感谢!! 展开
感谢!! 展开
1个回答
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解析
f‘(x)=x'(x+1)(x+2)....(x+n)+x(x+1)'(x+2)(x+3).....(x+n)+x(x+1)(x+2)'(x+3)...(x+n)
=(x+1)(x+2)..(x+n)+x(x+2)(x+3).....(x+n)+.....x(x+1)(x+2)...(x+n)'
=1*2*3*....n
=n!
f‘(x)=x'(x+1)(x+2)....(x+n)+x(x+1)'(x+2)(x+3).....(x+n)+x(x+1)(x+2)'(x+3)...(x+n)
=(x+1)(x+2)..(x+n)+x(x+2)(x+3).....(x+n)+.....x(x+1)(x+2)...(x+n)'
=1*2*3*....n
=n!
追问
=(x+1)(x+2)..(x+n)+x(x+2)(x+3).....(x+n)+.....x(x+1)(x+2)...(x+n)'
=1*2*3*....n
这一步到下一步是怎么的出来的呢?
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