若lim(an^2+2n+3)/(an^2-3n+4)=1/b,求ab的值

若lim[(2n-1)an]=1 求lim(n*an)的值 已知lim[(an^2+5n-2)/(3n+1)-n]=b,求a,b的值 lim (n→∞) (n^2/(an+b)-n^3/(2n^2-1))=1/4 求a,b 数列极限的运算lim an/(an+1) =2 求lim 2anlim (2n+1)*an=3 求lim n*an 已知：lim (n→∞) [(n^2+n)/(n+1)-an-b]=1 ,求a,b的值 等差数列{an},{bn}的前n项和分别为An,Bn,切An/Bn=2n/3n+1,求lim(n→∞)an/bn 数学题 lim（an^2+bn-100)/(3n-1) =2 求ab的值大神们帮帮忙 若lim(2n+(an^2-2n+1)/(bn+2))=1 求a/b的值 已知lim n→无穷 （an^2+bn+5）/(3n-2)=2,求a,b的值 若lim(2n-√4n^2+an+3)=1,n→∞,求a. lim[(n^2+1)/(n+1)-an-b]=o求a和b的值 lim[1/(a-1)^n]=0 求a的范围 已知数列an的前n项和Sn=(n^2+n)*3^n (1)求lim(n→∞)an/Sn (2).