求极限等差数列an和bn等差数列an和bn的前n项和分别用Sn和Tn表示 若Sn/Tn=4n/3n+5 则liman/bn的值为多少

若等差数列{an}和{bn}的前几项和为Sn和Tn,若Sn/Tn=2n-1/3-n,求an/bn的极限 求极限等差数列an和bn等差数列an和bn的前n项和分别用Sn和Tn表示 若Sn/Tn=4n/3n+5 则liman/bn的值为多少 {an}等差数列,an=21-2n,bn=|an|,求{bn}的前n项和Tnxx 在数列{an}和{bn}中,an>0,bn>0,且an,bn,a(n+1)成等差数列,bn,a(n+1),b(n+1)成等比数列,a1=1,b1=2,求an/bn. 等差数列{an} {bn}前n项和为An Bn,An/Bn=(7n+2)/(4n+27),求an/bn 等差数列{an} {bn}前n项和为An Bn,An/Bn=(7n+2)/(4n+27),求an/bn 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 计算等差数列{an}{bn}的前n项和分别为An.Bn,且An/Bn=2n/(n+1)求limn→∞(an/bn) 设数列an的前n项和为Sn,满足an+sn=An^2+Bn+1(A不等于0)an为等差数列,求(B-1)/A Bn分别是等差数列[an][bn]的前几项和,且An/Bn=(7n+45)/(n+3),求an/bn【详细过程, 已知两个等差数列{an}和{bn}的前n项和分别为An和Bn, 等差数列除以等比数列 an=n bn=2^n-3 求an除以bn的前n项和 等差数列An=2n+1 Bn=1/An^2-1 求Bn前N项和Tn 数列Cn=Bn*An,Bn是等差数列,An是等比数列,怎么求Cn的前n项和? 若数列{Cn}={An}*{Bn},{An}为等差数列,{Bn}为等比数列求{Cn}的和Sn 等差数列an和等比数列bn；(anbn)和（an+bn)的计算简便方法（等差数列和等比数列复合） 等差数列{an}的前n项和为An,等差数列{bn}的前n项和为Bn若Bn/An=n/3n+1 1.求a5/b5 2 an/bn 在数列{an}和{bn}是两个无穷等差数列,公差分别为d1和d2,求证：数列{an+bn}是等差数列,并求它的公差.