已知等差数列an的前n项和为sn,且a3=5,s6=36,则sn为
已知等差数列{An}的前n项和为Sn 且a3=5 S6=36
已知等差数列{An}的前n项和为Sn,且A3=5,S6=36.
已知等差数列{An}的前n项和为Sn,A3=5,S6=36 求An
已知等差数列﹛an﹜的前n项和为Sn,且a3=5,S6=36,bn=2an×2的an次方
已知等差数列{an}的前n项和为{Sn},已知a3=5.S6=36
已知{an}为等差数列,前n项和为Sn,S5=S6且a3=-6,(1)求数列{an}的通项公式
等差数列{an}的前n项和为Sn,已知S6=36,Sn=324,S(n-6)=144(n>6),则n为多少?
等差数列{an}的公差,d≠0,前n项和为Sn,且a1,a3,a9成等比数列,则S6/S10=
已知等差数列{An}的前n项和为Sn,且A3=5,S6=36.设bn=2^an+1/2,求数列bn的前n项和Tn
已知等比数列{an}的公比为q,前n项和为Sn,且S3,S9,S6成等差数列,给出下列结论:①a3,a9,a6成等差数列
设数列an的前n项和为Sn,已知S1=1,Sn+1/Sn=n+c/n,且a1,a2,a3成等差数列
设Sn为等差数列{an}的前n项和,已知s6=36,Sn=324 ,S(n-6)=144 ,(n>6) ,求n的值