已知等差数列{an}的前n项和为Sn,且满足S2=6,a3+a4=22,求an与Sn

已知等差数列{an}满足a3=15,a4+a6=22,Sn为an的前n项和 已知等差数列{an}满足:a3+a4=16,a4+a5=20,{an}的前n项和为Sn 已知等差数列【an】满足:a3=7,a5+a7=26.【an】的前n项和为Sn.(1)求a4及Sn; 已知等差数列{an}满足a3=7,a5+a7=26{an}的前n项和为Sn求a4及Sn 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 已知公差大于零的等差数列{an}的前n项和为Sn，且满足：a3•a4=117，a2+a5=22． 已知公差大于零的等差数列｛an｝的前n项和为Sn,且满足:a3*a4=117,a2+a5=22 已知公差数列大于零的等差数列{an}的前n项和为Sn,且满足a3*a4=117,a2+a5=22 等比数列{an}的前n项和为Sn,已知S1,S3,S2成等差数列,求{an}的公比Q.已知a1-a3=3,求sn? 已知公差数列大于零的等差数列{an}的前n项和为Sn,且满足a3*a4=117,a2+a5=22 （1）求数列{an}的 已知等差数列An前n项和是Sn,若A3=10,则求A4的最大值为 已知等差数列{an}满足a1=3.a4+a8=26,{an}的前n项和为Sn.求an及sn