求极限等差数列an和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 两个数列求An/Bn极限 已知{an},{bn}均为等差数列,前n项的和为An,Bn,且An/Bn=2n/(3n+1),求a10/b10的值 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. 已知等差数列an=2n-1,若数列bn=an+q^an,求数列｛bn｝的前n项和Sn,求详解 a1=1.an+1=2an+2^n.bn=an/2^n-1.证明bn是等差数列、求数列的前n项和sn? 已知等差数列an的通项公式为an=1+2n,令bn=an的平方-1,求bn的前n项和 已知{an}为等差数列,且a2=-8,若等差数列{bn}满足b1=-8,b2=a1+a2+a3,求{bn】的前项和Tn 已知an为等差数列,且a2=-8,若等差数列bn满足b1=-8,b2=a1+a2+a3,求bn的前n项和Tn. 等差数列｛an｝,｛bn｝,An/Bn=(7n+45)/(n+3),求an/bn为整数的n的值 正项等差数列an,a5=8,a4*a6=60,求an和sn,设数列bn满足bn=1/sn,求Tn 数列{An}和{Bn}是等差数列,A1=25,B1=75且A100+B100=100,求{An+Bn}前100项和