已知数列{an}a1=1 n>=2 Sn^2=an(Sn-1/2)证明是{1/Sn}等差数列
在数列{An}中,已知A1=1,An=2Sn^2/(2Sn-1),(n>=2),证明{1/Sn}是等差数列,并求Sn
数列an中,a1=1,当n大于=2时,sn满足sn方=an(sn-1) 证明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+2Sn*Sn-1=0,a1=1/2.求证:{1/Sn}是等差数列
已知数列{an}中的前几项和为Sn且满足a1=0.5,an=-2Sn*S(n-1).证明数列{1/Sn}为等差数列,求S
数列an ,a1=1,当n>=2时,an=(根号sn+根号sn-1)/2,证明根号sn是等差数列,求an
已知正项数列an的前n项和为Sn,a1=1,(an-2)²=8Sn-1.证明an是等差数列.
a1=1,n,an,Sn成等差数列,证明{Sn+n+2}是等比数列
数列An的前n项和为Sn,已知A1=1,An+1=Sn*(n+2)/n,证明数列Sn/n是等比数列
数列{an}中,a1=1,an=2Snˆ2/(2Sn-1)(n大于等于2) 1.证明{1∕Sn}是等差数列 2
已知数列{an}中,a1=1,且Sn,Sn+1,2S1成等差数列,用数学归纳法证明Sn=(2^n-1)/2^(n-1)
在数列an中 a1=1 An=2Sn^2/(2Sn-1) 证明1/sn是等差数列 并求 sn