等差数列前几项和SnTn,Sn/Tn=2n/3n+1求an/bn

等差数列前几项和SnTn,Sn/Tn=2n/3n+1求an/bn 已知anbn都是等差数列,其中n项和分别为sntn,若sn/tn=n/2n+1求a5/b5.求sn/bn anbn是两个等差数列sntn分别是前n项和sn/tn=3n-1/2n+3则a5/b6= 等差数列【An】与【bn】的前n项和分别为SnTn且Sn/Tn=(2n+2)/(n+3),求a6除以b9的值 两个等差数列{An}{Bn}前n项和分别为SnTn且Sn/Tn=3n 等差数列{an}和{bn}的前几项和分别为Sn和Tn,若Sn:Tn=2n:(3n+1),求a7:b7 若等差数列{an}和{bn}的前几项和为Sn和Tn,若Sn/Tn=2n-1/3-n,求an/bn的极限 已知等差数列{an}{bn}的前几项和,分别为sn、tn,若sn/tn=2n/3n+1.求a8/b8 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｛An｝和｛Bn｝的前n项和分别为Sn和Tn,且Sn/Tn=(2n+1)/(3n+2),则：A6/B6=? 等差数列an和bn的前n项和分别为sn和tn,且sn/tn=2n/3n+1,则a5/b5=? 两个等差数列｛an｝和｛bn｝的前n项和分别为Sn和Tn若Sn/Tn=3n+7 / n+2,则a7/b7=? 等差数列{an}和{bn}的前n项和分解为Sn和Tn,且Sn/Tn=2n/(3n+1),则a5/b5=? 两个等差数列｛an｝和｛bn｝的前n项和分别为Sn和Tn若Sn/Tn=3n+7 / n+2,则a7/b7=? 等差数列an和bn的前n项和分别是Sn和Tn,且Sn/Tn=(3n-3)/(2n+3),求a10/b7同上 两个等差数列{an}和{bn}的前n项和分别是Sn和Tn,Sn/Tn=2n+3/3n-1,求a9/b9 两个等差数列{an}和{bn}的前n项和分别是sn和tn,若sn/tn=(2n+3)/(3n-1),求a9/b9 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=