n^2/2n^2+1怎么化简成 1/2-1/2(2n^2+1)
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
化简(n+1)(n+2)(n+3)
n(n+1)(n+2)数列求和
n(n+1)(n+2)等于多少?
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
级数2/(n+2)(n+1)n 怎么求出答案
求教,N^0+N^1+N^2+N^3.N^n=?公式是什么?(N≠n且N,n都属于自然数)
阶乘(2n-1)!=(2n)!/(2^n*n!
化简[n^2+(n+1)^2]/n(n+1) 化简额