已知数列为等差数列且3a5=8a12>0 数列B满足bn=ana(n+1)a(n+2) bn的前n项和为Sn 当N 多大
数列题.已知数列{An}的前n项和为Sn,且Sn=n^2 +n,数列{bn}满足bn=1/AnA(n+1) ,Tn是数列
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
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
已知数列an是各项均不为0的等差数列,Sn为其前n项和,且满足S2n-1=1/2an^2,数列bn满足,当n为奇数时bn
设数列{bn}的前n项和为Sn,且bn=2-2s.数列{an}为等差数列,且a5=14,a7=20.
已知数列{an}的前n项和为Sn,a=1,an+1=2Sn+1(n∈N*),等差数列{bn}中,bn>0(n∈N*),且
设等差数列{an}的前 n项和为Sn,且 Sn=(an+1)^/2(n属于N*)若bn=(-1)nSn,求数列{bn}的
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 (1)求数列{bn
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=10,A7=14.(1)求数列An、{bn}
等差数列{An}的前n项和为Sn,且满足A3*A4=117,A2+A5=22 求通项An ;若数列{Bn}是等差数列,且
设数列{an}的前n项和为Sn,数列{bn}满足:bn=nan,且数列{bn}的前n项和为(n-1)Sn+2n