等差数列{An}前n项和为Sn,(Am-1)+(Am+1)-Am的平方=0,S2m-1=38,求m为多少m-1,m+1,2m-1,m都是下脚标

an是等差数列,sn为前N项和,Sm/Sn=m2/n2 则am/an= 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=? 设Sn为等差数列an的前n项和.求证Sn/n为等差数列 等差数列{an}的前n项和为sn,a10 设Sn为等差数列{An}的前n项和,求证：{Sn/n}是等差数列 已知等差数列{an}前n项和为Sn,若Sm/Sn=m^2/n^2,则am/am的值为? 已知an为等差数列,sn为其前n项的和,若sm/sn=m平方/n平方,则am/am=? 等差数列题等差数列an的前n项和为Sn,已知am-1 + am+1 -am^2 =0,S2m-1=38,则m= 等差数列{an}.前n项和为Sn.已知：Sn/Sm=(m^2)/(n^2),求am/am?噢 是打错了 等差数列An的前n项和为Sn,a1＝1,S3＝a5,Am＝2011求m 等差数列AN的前n项和为Sn,若S2m-1/2m-1=10,则am= 等差数列{an}前n项和为Sn=3n-2n^2,求an 等差数列{an}的前n项和为Sn,已知am-1+am+1-am^2=0,S2m-1=38,则m=___ 等差数列{An},的前n项和为Sn,已知Am-1+Am+1-(Am)*2=0,S2m-1=38,则m=? 等差数列{an}的前n项和为Sn,已知am-1+am+1-am^2=0,S2m-1=38,求m 等差数列{an}的前n项和为Sn,已知am-1+am+1-am²=0,S2m-1=38,求m的值 等差数列{an}的前n项和为Sn,已知am-1+am+1-am^2=0,S2m-1=38,则m=___ 尽快好吧 等差数列前n项和为Sn=1/2(An+1/An),求通项An