求大神:推导1^k+2^k+3^k+…+n^k=? (n属于N+,k为任意一非零自然数)

2024-11-22 17:06:16
推荐回答(1个)
回答1:

因为1^k,2^k,3^k,...,n^k是k阶等差数列,故
不妨设1^k+2^k+3^k+...+n^k
=a0(k)+a1(k)*n+a2(k)*n^2+...+ak+1(k+1)n^(k+1)
经计算可得:
a0(k)=0
ai(k)=P(k+1,k),i=1,…,k-1
ak(k)=1/2
ak+1(k+1)=1/k
其中
P(i,i)=1/k,i=1,…,k+1
P(i,j)=-(1/i)(∑(n=j,…,i-1)C(i,n-1)P(n,j),i