lim(n趋于无穷)[n(n+1)/2]/n方+3n的极限是多少?

lim( n/n+1)^(n+2) 趋于无穷 lim (1+2/n)^2=?n趋于无穷lim (1+2/n)^2=?n趋于无穷 lim 2n^2+n+1/n^2-2n+1n趋于无穷 lim(1/n^3+(1+2)/n^3+...+(1+2+...+n)/n^3)n趋于无穷 lim n趋于无穷时：[ln(n+2)/(n+2)]*[(n+1)/(ln(n+1)]? lim(n趋于无穷)[n(n+1)/2]/n方+3n的极限是多少? 求lim[(2n-1）/（2n+1)]^n,n趋于无穷 求极限：lim((2n∧2-3n+1)/n+1)×sin n趋于无穷 极限题：lim[n*tan(1/n)]^(n^2) (n趋于无穷） 求极限,lim(1+n)(1+n^2)(1+n^4)-----(1+n^2n)=?（n趋于无穷） 求极限 Lim（n趋于无穷）(n^(2/3) sinn^2)/(n-1)如题 Lim(1-3/2n)^4n+5.n趋于无穷,求极限 求函数极限 lim（n-1）*2^n n趋于正无穷 求极限lim n趋于无穷,(1/n^2+3/n^2+...+2n-1/n^2)rt lim (n趋于无穷)π/n(cos^2 π/n + .+ cos^2 (n-1)π/n )=? lim(n^2+1)/n(2n-1),n趋于正无穷lim(n^2+1)/n(2n-1)=？ 求lim(1-1/4)(1-1/9).(1-1/n^2) n趋于无穷 lim n趋于无穷(2n+3/2n+1)的n+1次方的极限怎么求