已知Sn是等差数列{an}的前项和,且a1=-1,S5=15.求an
设{an}是公比大于1的等比数列,sn为数列{an}的前项和.已知s3=7,且a1+3,3a2,a3+4构成等差数列
已知正项等比数列{an}中,首项a1=3前项和为sn,且s3+a3,s5+a5,s4+a4成等差数列
1.已知等差数列的{An}前n项和为sn,且s5=40,s8=100,求a1和公差d?2.已知等差数列{An}中,a1=
已知等差数列{an}的前n项和伟sn,公差d≠0,且s3+s5=50,a1,a4,a13城等比数列.求数
已知等差数列{an}的首项为a1,前n项和为Sn,令bn=a1/sn,且a5*b2=10/3,S5-S4=10.求:(1
已知数列{an}是公差不为零的等差数列,其前n项和为Sn,且S5=30,又a1,a3,a9成等比数列.
帮我解2道 数列1 设Sn是等差数列{An}的前项n和,若S3/S5 = 1/3 , 则 S6/ S12 ?2 等差数列
已知等差数列{an}前n项和为Sn,公差d≠0,且S3+S5=50,a1,a4,a13,成等比数列,求{an}通项公式.
已知等差数列{an}前n项和为Sn,公差d≠0,且S3+S5=50,a1,a4,a13,成等比数列 设{bn/an}是首
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
设Sn是等差数列{an}(n∈N+)的前n项和,且a1=1,a4=7,则S5=______.
已知{an}是公差不为0的等差数列,a1=1,且a1,a3,a9成等比数列,求数列{2^an}的前n项和Sn