两等差数列{an}和{bn},前n项和分别为Sn,Tn且Sn/Tn=7n+2/n+3则a2+a20/b7+b15=

等差数列{an},{bn}中的前n项和分别是An,Bn,且An/Bn=n/3n-2,则a5/b5=多少 已知两个等差数列{an}和{bn}的前n项和分别为An和Bn, 已知两个等差数列an和bn的前n项和分别为已知两个等差数列{an}和{bn}的前n项和分别是An和Bn,且An/Bn= (7n+45)/(n+3),则使得an/bn为整数的正整.为什么an/bn=An-1/Bn-1?这步不懂~ 已知等差数列{An}和{Bn}的前n项和分 别为An和Bn,且An/Bn=（7n+41）/（ n+3）,则得An/Bn为整数的正整数n的 个数是. 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 等差数列an,bn的前n项和分别是Sn,TnSn/Tn=2n/3n+1 求an/bn 已知两个等差数列{an},{bn}的前n项和分别是Sn,Tn,若 Sn/Tn =(2n)/(3n+1),则 an/bn=______. 两等差数列﹛an﹜﹛bn﹜前n项和之比为5n+3/2n+7.则an/bn的值为? 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 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) （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； {an}等差数列,an=21-2n,bn=|an|,求{bn}的前n项和Tnxx 等差数列一道题{an}{bn}是等差数列前n项的和分别是Sn和Tn sn/tn =7n+2/n+3 求a5/b5 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},{bn}的前n项和分别是An和Bn,且An/Bn=(7n+1)/4n+27,则a11/b11的值为?答案4/3…… 4n+27是分母 抱歉 若数列AN,BN,均为等差数列,且前N项和分别是SN,TN,为什么AN/BN=S2N-1/T2N-1 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