sn/tn=7n45/n3

{an}是等差数列S7=7S15=75Tn是数列{Sn/n}的前n和求Tn{an}是等差数列S7=7S15=75Tn是数列{Sn/n}的前n和求Tn{an}是等差数列S7=7S15=75Tn是数列{S

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=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

已知两个等差数列{an}、{bn}的前n项和分别为Sn,Tn,且Sn/Tn=7n+1/4n+27,则a11/b11=已知两个等差数列{an}、{bn}的前n项和分别为Sn,Tn,且Sn/Tn=7n+1

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=?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/

若两个等差数列{an}和{bn}的前n项和分别是Sn,Tn,已知Sn/Tn=7n/(n+3),则a5/b5=若两个等差数列{an}和{bn}的前n项和分别是Sn,Tn,已知Sn/Tn=7n/(n+3)

设Sn,Tn分别是两个等差数列{an}{bn}的前n项之和,若Sn/Tn=7n+1/4n+27,则an:bn=?设Sn,Tn分别是两个等差数列{an}{bn}的前n项之和,若Sn/Tn=7n+1/4n

若两个等差数列{An}和{Bn}的前n项和分别是Sn、Tn,已知Sn/Tn=7n/(n+3),则a5/b4=若两个等差数列{An}和{Bn}的前n项和分别是Sn、Tn,已知Sn/Tn=7n/(n+3)

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=?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/

已知等差数列an,bn的前n项和为Sn和Tn且Sn/Tn=(4n-5)/(7n+1),则a8/b8=已知等差数列an,bn的前n项和为Sn和Tn且Sn/Tn=(4n-5)/(7n+1),则a8/b8=

设两个等差数列{an},{bn}的前n项和分别为Sn,Tn.若Sn/Tn=7n+1/4n+27,则a7/b7=设两个等差数列{an},{bn}的前n项和分别为Sn,Tn.若Sn/Tn=7n+1/4n+

两个等差数列｛an｝｛bn｝的前n项分别为SnTn,若Sn/Tn=7n+3/n+3,则a8/b8=两个等差数列｛an｝｛bn｝的前n项分别为SnTn,若Sn/Tn=7n+3/n+3,则a8/b8=两个

{an},{bn}是两个等差数列,其前n项和分别为Sn和Tn,且Sn/Tn=(7n+2)/(n+3),则a8/b8={an},{bn}是两个等差数列,其前n项和分别为Sn和Tn,且Sn/Tn=(7n+

等差数列{an},{bn},的前n项和分别为Sn,Tn且Sn/Tn=(7n+2)/(3n+4)则a10/b10=等差数列{an},{bn},的前n项和分别为Sn,Tn且Sn/Tn=(7n+2)/(3n

以Sn,Tn分别表示等差数列{an},{bn}的前n项和,若Sn/Tn=7n/(n+3),则a5/b5=以Sn,Tn分别表示等差数列{an},{bn}的前n项和,若Sn/Tn=7n/(n+3),则a5

等差数列an`bn`的前n项和分别为Sn`Tn.若Sn/Tn=(7n+1)/(4n+27),求an/bn等差数列an`bn`的前n项和分别为Sn`Tn.若Sn/Tn=(7n+1)/(4n+27),求a

设等差数列{an},{bn}的前n项和分别是Sn,Tn,且Sn/Tn=7n+2/n+3求a5/b5设等差数列{an},{bn}的前n项和分别是Sn,Tn,且Sn/Tn=7n+2/n+3求a5/b5设等

等差数列｛an｝,｛bn｝的前n项和分别为Sn,Tn,An/Bn=(7n+1)/(4n+27)求Sn/Tn等差数列｛an｝,｛bn｝的前n项和分别为Sn,Tn,An/Bn=(7n+1)/(4n+27)

已知等差数列anbn的前n项和分别为sntn若sn／tn=7n+1／4n+27已知等差数列anbn的前n项和分别为sntn若sn／tn=7n+1／4n+27已知等差数列anbn的前n项和分别为sntn

等差数列{an}与{bn}的前n项和分别是Sn和Tn,已知Sn/Tn=7n/n+3,则a5/b5等于多少?等差数列{an}与{bn}的前n项和分别是Sn和Tn,已知Sn/Tn=7n/n+3,则a5/b

等差数列An与Bn的前n项和分别是Sn和Tn,Sn/Tn=(7n+3)/(n+3),求A7/B7等差数列An与Bn的前n项和分别是Sn和Tn,Sn/Tn=(7n+3)/(n+3),求A7/B7等差数列