Sn为等差数列的前n项和,Sn=m,Sm=n,求:Sm+n
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(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=?
等差数列前n项和Sn Sm=k Sk=m 求Sm+k
设等差数列{an}的前n项和为Sn,若存在正整数m,n(m<n),使得Sm=Sn,则Sm+n=0
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
若等差数列{An}的前m项和为Sm,前n项和为Sn,且Sm:Sn=m²:n²,则Am:An=?
等差数列前n项和Sn,前m项和Sm=n,Sn=m,(m大于n,).求Sm+n
等差数列前n项和为Sn ,若Sn=Sm(m>
1.等差数列{an},{bn}的前n项和分别为Sn,Tn,(1)若Sm=n,Sn=m,求Sn+m
{an}是等差数列前n项和Sn已知Sm=a Sn-Sn-m=b 求Sn