若lim n->无穷 [ 2n^2/(n+2) - an ]=b,求常数a,b的值 求过程,感谢..

lim(2^n+3^n)^1 (n趋向无穷) lim(1+1/(n+2))^n其中n趋近无穷 lim( n/n+1)^(n+2) 趋于无穷 lim 2n^2+n+1/n^2-2n+1n趋于无穷 lim(n+2)(n-1)/3n^2+2n+1= n趋近于无穷 lim(1/n^3+(1+2)/n^3+...+(1+2+...+n)/n^3)n趋于无穷 lim(n/(n^2+1)+...+n/(n^2+n))x趋向于无穷 求解答过程~ lim n趋于无穷时：[ln(n+2)/(n+2)]*[(n+1)/(ln(n+1)]? 1、lim n->无穷 根号[(n^4+n+1)-n^2]*(3n+4) lim[1^n+2^n+3^n]^(1/n)等于多少n→无穷 lim(n趋于无穷)[n(n+1)/2]/n方+3n的极限是多少? lim (1+2/n)^2=?n趋于无穷lim (1+2/n)^2=?n趋于无穷 高数 lim n趋向无穷 lim（3^(1/n)-1)ln(2+2^n) lim(n-无穷)=3n^2/5n^2+2n-1, lim(n->无穷)[(1+3+5+.(2n+1)]/n^2]^(3-2n) 求lim[(2n-1）/（2n+1)]^n,n趋于无穷 lim(n趋向无穷){[(n^2+1)^(1/2)]/(n+1)}^n怎么解. 求极限 lim(n无穷)n【(根号（n^2+1)-根号（n^2-1)】