Sn=a1n+n(n-1)d/2
Sn/n=a1+(n-1)d/2
公差为d/2,首项为a1
等差数列的性质：若{an}是公差为d的等差数列,则数列{sn/n}也是等差数列,且公差为____?
1个回答
相关问题
-
若数列{an}是公差为d的等差数列,则数列{an+2a(n+2)}是公差为多少的等差数列
-
记数列{an}的前n项和为Sn,若{Sn/an}是公差为d的等差数列,则{an}为等差数列时d=
-
记数列{an}的前n项和为Sn,若{Sn/an}是公差为d的等差数列,则{an}为等差数列的充要条件是d=?
-
等差数列的性质{a(n)}为等差数列,公差为d,则Sn,S2n-Sn,S3n-S2n,也为等差数列,其公差为多少?
-
记数列{an}的前n项和为Sn，若{Snan}是公差为d的等差数列，则{an}为等差数列的充要条件是d=______．
-
若数列{an},{bn}是等差数列,公差分别为d1,d2,则数列{a2n},{an,2bn)是不是等差数列?如果是,公差
-
设数列｛an｝是公差为d的等差数列
-
数列{an}是公差为d的等差数列,用定义法证明数列{a（4n-3）}是等差数列
-
已知数列(an)的奇数项是公差为d1的等差数列,偶数是公差为d2的等差数列,Sn是数列an的前n项和,a1=1a2=2.
-
等差数列｛an｝前n项和为Sn,且Sn=3n^2+n 求公差d