等差数列{an}和{bn}的前n项和是Sn和Tn,对一切自然数n都有Sn/Tn=2n/3n+1,则a5/b5是多少?

等差数列问题,疑惑,等差数列an bn的前n项和是S T S/T=2n/(3n+1)求an/bn怎么求, 已知两个等差数列{an}和{bn}的前n项和分别为An和Bn, 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? 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 两个等差数列{an}、{bn}的前n项和Sn、Tn之间的关系为an/bn = S(2n-1) / T(2n-1). 已知两个等差数列an和bn的前n项和分别为an和bn,且an/bn=7n+45 +3,则使的ann为整数的正整数n的个数是 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. 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 已知两个等差数列{an}和{bn}的前n项和分别为An和Bn,且An/Bn = (5n+63)/(n+3),则使得an / bn为整数的正整数n的个数是 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) {an}等差数列,an=21-2n,bn=|an|,求{bn}的前n项和Tnxx 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? 证明：数列{an}为等差数列的充要条件是{an}前n项和Sn=An^2+Bn 已知数列{an}的前n项和sn满足sn=an^2+bn,求证{an}是等差数列 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Sn为等差数列An的前n项和,Bn=Sn/n(n属于正整数）,求证：数列Bn是等差数列 等差数列问题,疑惑,差数列an bn的前n项和等差数列an bn的前n项和是S T S/T=2n/(3n+1)求an/bnSn=(n/2)(a1+an)=(n/2)(Dn+2a1-D)……设D是数列{an}的公差Tn=(n/2)(b1+bn)=(n/2)(dn+2b1-d)……设d是数列{bn}的公差Sn/Tn=(Dn+2a1 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