lim n→∞ an^2+bn+1/3n-2=-2,求a,b之值

lim (n→∞) [(an^2+bn+c)/(2n+5)]=3,求a,b 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 已知lim n→无穷 （an^2+bn+5）/(3n-2)=2,求a,b的值 a,b为常数.lim（n->无穷）an^2+bn+2/2n-1=3 求a,b 若lim(2n+(an^2-2n+1)/(bn+2))=1 求a/b的值 lim[{根号(n^2+an)}-(bn+1)]=b,求a lim (n→∞) (n^2/(an+b)-n^3/(2n^2-1))=1/4 求a,b 已知：lim (n→∞) [(n^2+n)/(n+1)-an-b]=1 ,求a,b的值 若lim[2n+(an^2+2n+1)/(bn+1)=1,则a+b 1 lim[2n+1-根号(an^2+bn+1)]=2 求a b的值 已知lim[(3n^2+cn+1)/(an^2+bn)-4n]=5,求常数a、b、c的值 求数列极限lim=[(an^2+bn-1)/(4n^2-5n+1)]=1/b 求a b的值