2N N2 2N2
2N N2 2N2
大一求极限lim(n/(n2+1)+n/(n2+2^2)+……+n/(n2+n2))
计算lim(1/n2+1+2/n2+1+3/n2+1+...+n/n2+1)
求极限lim((n+1)/(n2+1)+(n+2)/(n2+2)+...+(n+n)/(n2+n)),n趋近无穷
请问如何证明lim(n→∞)[n/(n2+n)+n/(n2+2n)+…+n/(n2+nn)]=1,
1.求lim[1/(n2+n+1)+2/(n2+n+2)+.+n/(n2+n+n)][n趋于无穷][n2为n的平方]
求 证Lim ( n/ n2+1) + (n/ n2+2) +( n/ n2+3).+(n/n2+n)当n趋向无穷时的极
求lim【1/(n2+π)+1/(n2+2π)+...+1/(n2+nπ)】(n趋向于正无穷)
怎样证明n2+n,n+1/2,n2+n+1/2是直角三角形
N ,2N ,N2 ,2N2,2S2- ,S-2,的符号含义
已知x=2n/1+n2,y=1-n2/1+n2,求x2+y2的值
若n2+n-1=0,则n3+2n2+2008=___.