数列an的前n项和sn满足an+2snsn-1=0(n>=2)且a1=1/2 1、求证数列1/sn为等差数列 2、求通项
数列an的前n项和sn满足an+2snsn-1=0(n>=2)且a1=1/2 1、求证数列1/sn为等差数列 2、求通项
已知数列{an}的前n项和为Sn,且满足an+2Sn*Sn-1=0,a1=1/2.求证:{1/Sn}是等差数列
已知数列{an}的前n项和为Sn,且满足Sn=Sn-1/2Sn-1 +1,a1=2,求证{1/Sn}是等差数列
已知数列an的前n项和为Sn,且满足an+SnSn-1=0(n>=2,n∈N*),a1=1/2.
已知数列{an}的前n项和为Sn,且满足a1=1,Sn-Sn-1=2SnSn-1(n≥2).
已知数列an的前n项和为sn且满足a1=1,sn-sn-1=2snsn-1拜托各位大神
已知数列{an}的前n项和为Sn,且满足a1=1/2,an+2SnSn-1=0(n>=2)
已知数列{an}的前n项和为Sn,且满足a1=12,an+2SnSn-1=0(n≥2).
设数列an的前n项和为Sn,a1=1,an=(Sn/n)+2(n-1)(n∈N*) 求证:数列an为等差数列,
已知数列An的前n项和为Sn.且满足an+2Sn*Sn-1=0=2>,a1=1/2,求证1/Sn是等差数列,求通项an的
已知数列an的前n项和为Sn,且满足a1=1/2,An=-2SnSn-1 n>=2
已知数列{an}的前n项和为Sn,且满足a1=1/2,an=-SnSn-1(n>=2)