设等差数列前N项的和为SN,若SN=SM,则S(M+N)=?
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
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=?
数学题设数列An等差数列前n项和为Sn若m不等于n,Sn=m平方,Sm=n平方,求S(m+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=?
Sn为等差数列的前n项和,Sn=m,Sm=n,求:Sm+n
设等差数列{an}的前n项和为sn,若sm-1=-2,sm=0,sm+1=3,则m=
设等差数列{an}的前n项和为Sn,若Sm-1=-2,Sm=0,Sm+1=3,则m=( )
设等差数列An的前n项和为Sn,若Sm=Sk=b则Sm+k=
等差数列前n项和为Sn ,若Sn=Sm(m>
已知等差数列{an}的前n项和为Sn若Sn=Sm(n不等于m)则Sn+m=?
已知等差数列{An}前n项的和Sn,若Sm/Sn=m²/n²,则a5/a6
等差数列中前n项和为Sn若Sm等于n,Sn等于m求S{m+n}