等差数列的前n项和为sn,且s3=6,a1=4,则公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( )
等差数列{an}前n项和sn且s3=6,a3=4,则公差d等于
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.
在等差数列{an}中,Sn为其前n项和,且a1=13,S3=Sn
已知公差不为0的等差数列{an}的前n项和为Sn,S3=a4+6,且a1,a4,a13成等比数列.
设等差数列{an}的首项及公差均是正整数,前n项和为sn,且a1>1,a4>6,s3≤12,则a2013=?
设{an}是公比大于1的等比数列,Sn为其前n项和,且S3=7,a1+3、3a2、a3+4构成等差数列.