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)=0ai(k)=P(k+1,k),i=1,…,k-1ak(k)=1/2ak+1(k+1)=1/k其中P(i,i)=1/k,i=1,…,k+1P(i,j)=-(1/i)(∑(n=j,…,i-1)C(i,n-1)P(n,j),i