若等差数列an bn的前n项和An Bn满足An/Bn=（7n+1）/（4n+27）,求a9/b13没打错,就是a9/b13

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{an},{bn}的前n项和分别为An,Bn,切An/Bn=2n/3n+1,求lim(n→∞)an/bn 已知等差数列{an}和{bn},他们的前n项之和为An和Bn,若An/Bn=(5n+3)/(2n-1)A9/B9 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) 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 若两个等差数列｛an｝、{bn}的前n项和An、Bn,且满足An/Bn=(4n+2)/(5n-5),则a13/b13 {an}等差数列,an=21-2n,bn=|an|,求{bn}的前n项和Tnxx 若两个等差数列{an}和{bn}的前n项An和Bn,满足关系式An/Bn=2n+1/4n+27（n∈N*),求an/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 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 等差数列{an}{bn}的前n项和分别为An,Bn,An/Bn=7n+1/4n+27,a5/b5=? 等差数列{An},{bn}的前n项和为An,Bn,且An/Bn=n/3n-2,则a5/b5=? 等差数列｛an｝,｛bn｝的前n项和分别为An,Bn,An／Bn＝7n＋1／4n＋27,a5／b5等于多少 两个等差数列{an}{bn}的前n项和分别为An,Bn且An/Bn=(n-3)/(3n+1)则a6/b6 等差数列{an},{bn}的前n项和分别为An,Bn,且An/Bn＝7n+45/n+3,则a5/b5等于? （1）若两等差数列{an},{bn}的前n项和分别为An,Bn,满足An/Bn=（7n+1）/（4n+27）,则a11/b11的值为（ ）（2）已知等比数列｛an},首项为81,数列{bn}满足bn=log3（an）,其前n项和为Sn.①证明{bn}为等差数列； 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