lim(an^2/(3n+1)-n)=b a+b=?

lim (n→∞) (n^2/(an+b)-n^3/(2n^2-1))=1/4 求a,b lim(an^2/(3n+1)-n)=b a+b=? 若lim (3n^2+5)An=2,且lim （1-n^2）An? 已知lim n→∞ (an^2/3n+1-n)=b,a+b=?[(an^2/3n+1)-n]=b lim(n趋于无穷大)(5n^2+3n)/(an^2+b)=多少 lim(n->无穷)[(3n^2+cn+1)/(an^2+bn)-4n]=5求常数a、b、c 已知：lim (n→∞) [(n^2+n)/(n+1)-an-b]=1 ,求a,b的值 数列极限的运算lim an/(an+1) =2 求lim 2anlim (2n+1)*an=3 求lim n*an a,b为常数.lim（n->无穷）an^2+bn+2/2n-1=3 求a,b 若lim(n→∞)[(n^3-1)/(n^2-3n+1)+an+b]=1,则a+b=? 若lim[(2n-1)an]=1 求lim(n*an)的值 数列极限（已知lim[（2n-1）an]=2,求lim n*an） 若lim[2n+(an^2+2n+1)/(bn+1)=1,则a+b 若lim(an^2+2n+3)/(an^2-3n+4)=1/b,求ab的值n不是下标, lim n→∞ an^2+bn+1/3n-2=-2,求a,b之值 已知lim(n→∞) [(an^2+bn-100)/(3n-1)]=2,求a、b的值. 1 lim[2n+1-根号(an^2+bn+1)]=2 求a b的值2 lim(-3)^(n+1)+a^(n+1)/(-3)^n-a^n lim（n2+2n+2）/（n+1）-an）=b,求a,bn2是n平方lim（（n平方+2n+2）/（n+1）-an）=b