6/1+15/1+35/1+63/1…+(2n-1)(2n+1)/1怎么做?
2^n/n*(n+1)
证明不等式:(1/n)^n+(2/n)^n+(3/n)^n+.+(n/n)^n
lim[n/(n*n+1*1)+n/(n*n+2*2)+...+n/(n*n+n*n)],当x趋向无穷大时,怎么求极限,
[3n(n+1)+n(n+1)(2n+1)]/6+n(n+2)化简
用数学归纳法证明 1+2+3+..+n=1\2n(n+1)怎么做
求极限 lim n[1/(n^2+1)+1/(n^2+2^2)+……+1/(n^n+n^n)] (n趋向于无穷大,n^n
用c++编写 n^1+n^2+n^3+……+n^20 n=1,2,3,4,5,用一个递归函数怎么做?
(1/(n^2 n 1 ) 2/(n^2 n 2) 3/(n^2 n 3) ……n/(n^2 n n)) 当N越于无穷大
Sn=n(n+2)(n+4)的分项等于1/6[n(n+2)(n+4)(n+5)-(n-1)n(n+2)(n+4)]吗?
级数2/(n+2)(n+1)n 怎么求出答案
(n+1)+n+(n-1)+(n-2)…+3+2+1怎么化简
组合:C(n,0)+C(n,1)+……+C(n,n)=n^2