等差数列an的前几项和为Sn,已知S3=6,a1=11,则公差d等于
等差数列an的前几项和为Sn,已知S3=6,a1=11,则公差d等于
等差数列{an}的前n项和为Sn,且S3=6,a1=4,则公差d等于
等差数列{an}的前n项和为sn,且S3=6,a1=4,则公差d等于______.
等差数列{an}的前n项和为sn,且s3=6,a1=4,则公差d等于多少
(2014•齐齐哈尔三模)等差数列{an}的前n项和为Sn,且S3=6,a1=4,则公差d等于( )
已知等差数列{an}的公差d>0,设{an}的前几项和为Sn,a1=1,S2×S3=36,求m,k(m,k∈N*)
已知等差数列{an}的公差d不等于0,其前n项和为sn,且a1,a3,a9成等比数列,则s3/s7=多少
已知等差数列{an}的公差d>0,设{an}的前n项和为Sn,a1=1,S2•S3=36.
设等差数列{an}的前n项和为Sn 已知S3=S12 则当公差d
已知等差数列{an}的前n项和为Sn,公差d≠0,且S3=9,a1,a3,a7成等比数列.
已知等差数列{an}的前n项和为Sn,公差d≠0,且S3+S5=50,a1,a4,a13成等比数列.
已知等差数列{an}的前n项和为Sn,若S3=6,a3=4.则公差d=多少