数列{an}首项a1=3通项an与前n项的Sn之间满足2an=SnS(n-1) (n>=2)求证{1/Sn}为等差数列并
数列{an}首项a1=3通项an与前n项的Sn之间满足2an=SnS(n-1) (n>=2)求证{1/Sn}为等差数列并
数列{an}首项a1=3通项an与前n项的Sn之间满足2an=SnS(n-1) (n>=2)
已知数列an的前n项和为Sn,且满足 a1=1/2,An=-2SnS(n-1) n>=2 ①求证1
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,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
已知正项数列{An}首项A1=1,前n项和Sn满足An=√Sn+√Sn-1(n≥2)求证{√Sn}为等差数列,并求An通
数列{an}的首项a1=1,前n项和Sn与an之间满足an=2Sn^2/2Sn -1 (n>=2)
数列an首项a1=1前n项和sn与an之间满足an=2Sn^2/(Sn-1)(n大于等于2)
数列{An}的首项A1=3,通项An 前n项和 Sn之间满足2An=Sn×Sn-1(n≥2,n∈N*) (1) 求证:数
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,并求a
已知数列an首相a1=3,通项an和前n项和SN之间满足2an=Sn*Sn-1(n大于等于2)