f(n)=(1/n+1)+(1/n+2)+.+(1/n+3),则f(k+1)=最后一项是1/3n+1.看错了--

题目详情

f(n)=(1/n+1)+(1/n+2)+.+(1/n+3),则f(k+1)=
最后一项是1/3n+1 .看错了- -

▼优质解答

答案和解析

最后一项是(1/n+3)?
f(n)=(1/n+1)+(1/n+2)+.+(1/n+3)
=1/n+1+1/n+2+...1/n+3
=3/n+6
f(k+1)=3/(k+1)+6

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