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,切An/Bn=2n/3n+1,求lim(n→∞)an/bn 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项和的比为Sn:Sn''=5n+3:2n+7,则a5:b5=? 等差数列{an},{bn}的前n项和分别为Sn,Tn,若Sn/Tn＝2n/3n+1,则a5/b5=? 等差数列{an}{bn}的前n项和分别为Sn,Tn,若Sn/Tn=2n/3n+1,求a5/b5=多少 两个等差数列｛an｝和｛bn｝的前n项和分别是Sn,Tn,已知Sn／Tn=7n／(n+3),则a5／b5等于? 两个等差数列{an},{bn},a1+a2+...+an/b1+b2+...+bn=7n+2/n+2,则a5/b5=? 等差数列,{an},{bn}的前n项和分别是Sn,Tn.若Sn/Tn=2n/3n+1,求a5/b5的值 已知等差数列an和bn的前n项和分别为An,Bn,且An/Bn=(3n+1)/(2n-1).若ak/bk=34/21,则 已知两个等差数列｛an｝和｛bn｝的前n项和分别为An,Bn,且An/Bn=（3n-3）/（2n+3）,则a6／b6＝ 设数列｛Bn｝的前n项和为Sn,且Bn=2-2Sn;数列｛An｝为等差数列,且A5=14,A7=20. 设数列{bn}的前n项和为sn,且bn=2-2sn;数列{an}为等差数列,且a5=14,a7=20求