等差数列前n项和{Sn},S8=132,Sm=690,Sm-8=270,求m
等差数列前n项和{Sn},S8=132,Sm=690,Sm-8=270,求m
等差数列{an}的前n项和为Sn,已知S8=132,Sm=690,Sm-8=270(m>8),则m为( )
等差数列前n项和Sn Sm=k Sk=m 求Sm+k
Sn为等差数列的前n项和,Sn=m,Sm=n,求:Sm+n
等差数列an前n项和为Sn=m,Sm=n,求Sm+n的值
等差数列前n项和Sn,前m项和Sm=n,Sn=m,(m大于n,).求Sm+n
等差数列(an),前n项和为Sn.(1)Sm=n,Sn=m.求Sm+n的值(2)Sm=Sn(m不等于n)求Sm+n的值
在等差数列{an}中,设前m项和为Sm,前n项和为Sn,且Sm=Sn,m不等于n,则Sm+n=?
{an}是等差数列前n项和Sn已知Sm=a Sn-Sn-m=b 求Sn
等差数列{an}的前n项和Sn=m,前m项和Sn=n(m>n),求前m+n项和Sm+n
等差数列前n项和为Sn ,若Sn=Sm(m>
以知等差数列(AN)前K项和为SK且SN=M,SM=N,(M》N)求SM N