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-1=-2,sm=0,sm+1=3,则m=
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
设等差数列an的前n项和为Sn,若Sm=0,Sm+2=2,Sm+4=8,则公差d=
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=?
设等差数列An的前n项和为Sn,若Sm=Sk=b则Sm+k=
(2014•安徽模拟)已知等比数列{an}的前n项和为Sn,若Sm+3-Sm+2=8(Sm-Sm-1)(m>1,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=?
等差数列an前n项和为Sn=m,Sm=n,求Sm+n的值
在等差数列已知数列{an} 中,设前m项和为Sm,前n项和为Sn,且Sm=Sn (m不等于n),求Sm+n
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( )