设等差数列{an}与{bn}的前n项之和分别为Sn与S
设等差数列{an}与{bn}的前n项之和分别为Sn与S
设等差数列{an}与{bn}的前n项之和为Sn,S`n,Sn/S`n=7n+2/n+3,求a7/b7
设等差数列{an}与{bn}的前n项之和分别为:Sn与Tn,且Sn/Tn=(6n+2)/(2n+3),求a8/b8的值
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=?
设数列{an},{bn}都是等差数列,它们的前n项和分别为sn,Tn
等差数列{an}和{bn}的前n项和分别为Sn与Tn,对一切自然数n,都有
已知等差数列{an},{bn}的前n项和分别为Sn和Tn,若S
等差数列{an},{bn}的前n项和分别为Sn和Tn,若S
已知等差数列{an}{bn}的前n项和分别为Sn,Tn,若S
等差数列{An},{Bn}的前n项和为Sn与Tn,若Sn/Tn=2n/3n+1,则An/Bn的值是?
两等差数列{an}和{bn},前n项和分别为Sn,Tn,且S
1.已知等差数列{an}与{bn}的前n项之和分别是Sn与Tn,若Sn/Tn=(2n+2)/(n+3),求a7/b7的值