等差数列{an}的公差为d,且a5=10,S3=3,则首项a1和公差d分别是---
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中,an=-3n+1,则首项a1和公差d的值分别为
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
等差数列an的前几项和为Sn,已知S3=6,a1=11,则公差d等于
设{an}是公差d≠0的等差数列,Sn是它的前n项和,若a1=4,且S3/3和S4/4的等比中项为S5/5,求{an}的
等差数列an中 已知a5=8 s5=10 求首项a1和公差d
{an}等差数列,{bn}等比数列,公差公比均为d,且a1=b1,a3=3b3,a5=5b5,求{an}和{bn}?
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.