已知数列an的前n项和为sn，且满足an+2sn*s(n-1)=0(n≥2),a1=1/2

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an+2Sn*Sn-1=0,a1=1/2.求证：{

已知数列{an}的前n项和为Sn,且满足an+2Sn*S(n-1)=0(n>=2),a1=0.5.(1)求证：{1/Sn}是等差数列（2）求an已知数列{an}的前n项和为Sn,且满足an+2Sn*S

已知数列｛an｝的前n项和为Sn,且满足an+2Sn×S(n-1)=0,a1=1/2.（1）求证：｛1/Sn｝是等差数列；（2）求数列｛an｝的通项公式.已知数列｛an｝的前n项和为Sn,且满足an+

已知数列{an}a1=2前n项和为Sn且满足SnSn-1=3an求数列{an}的通项公式an已知数列{an}a1=2前n项和为Sn且满足Sn+Sn-1=3an求数列{an}的通项公式an已知数列{an

已知数列{an}的前n项和为sn,且an=sn*s(n-1)a1=2/9求证:{1/sn}为等差已知数列{an}的前n项和为sn,且an=sn*s(n-1)a1=2/9求证:{1/sn}为等差已知数列

已知数列{an}的前n项和为sn,且满足a1=1/2,an+2snsn-1=0(n≥2)(1)问:数列{1/Sn}是否为等差数列?(2)求Sn和an已知数列{an}的前n项和为sn,且满足a1=1/2

已知数列an的前n项为Sn,且满足Sn=S(n-1)/2S(n-1)+1(n≥2）,a1=2(1)求证:{1/Sn}是等差数列(2)求an的表达式.已知数列an的前n项为Sn,且满足Sn=S(n-1)

已知数列{an}满足Sn+Sn-1=tan2(t>0,n≥2),且a1=0,n≥2时,an>0.其中Sn是数列an的前n项和.已知数列{an}满足Sn+Sn-1=tan2（t＞0,n≥2）,且a1=0

已知数列{an}的前n项和满足a1=1/2,an=-Sn*S(n-1),(n大于或等于2）,求an,Sn已知数列{an}的前n项和满足a1=1/2,an=-Sn*S(n-1),(n大于或等于2）,求a

已知数列{an}的前n项和为Sn,a1=1/2,且Sn=n^2An-n(n-1),求an已知数列{an}的前n项和为Sn,a1=1/2,且Sn=n^2An-n(n-1),求an已知数列{an}的前n项

已知数列{an}的首项a1=1/2,Sn是其前n项的和,且满足Sn=n^2an,则次数列的通项公式为an=?Sn=n²an已知数列{an}的首项a1=1/2,Sn是其前n项的和,且满足Sn=

已知数列{an}的前n项和为Sn,满足Sn=n2an-n2(n-1),且a1=1/2,求{an}的通项已知数列{an}的前n项和为Sn,满足Sn=n2an-n2(n-1),且a1=1/2,求{an}的

短时间内一定采纳,谢谢）已知数列{An}的前n项和为Sn且满足an=2S(n-1)Sn(n>=2),a1=1.已知数列{An}的前n项和为Sn且满足an=2S(n-1)Sn(n>=2),a1=1.(1

(1/2)已知数列{an}的前n项和为Sn,且满足a1=1/2,an+2SnS(n-1)=0(n>=2,n属于N)(1)求an和Sn(1/2)已知数列{an}的前n项和为Sn,且满足a1=1/2,an

数列{an}的前n项和为Sn,p为常数,且满足a1=2,Sn=4an+Sn-1-pan-1(n≥2),又已数列{an}的前n项和为Sn,p为常数,且满足a1=2,Sn=4an+Sn-1-pan-1(n

已知数列{an}的前n项和为Sn,且满足an+2SnSn-1=0(n≥2,n∈N+),a1=1/2(1)判断{1/Sn},、{An}是否是等差数已知数列{an}的前n项和为Sn,且满足an+2SnSn

已知数列An的前n项和Sn满足An+2Sn*Sn-1=0,n大于等于2,A1=1/2,求An.已知数列An的前n项和Sn满足An+2Sn*Sn-1=0,n大于等于2,A1=1/2,求An.已知数列An

数列an的前n项和为Sn,且满足an+2Sn*S(n-1)=0,(n大于等于2),a1=1/2.证1/Sn等差,求an表达式!希望速...数列an的前n项和为Sn,且满足an+2Sn*S(n-1)=0

已知数列{An}中,A1=-1,前n项和为Sn(Sn不等于0）,满足Sn乘以S(n-1)=An(n大于等于2）,求数列的通项公式.已知数列{An}中,A1=-1,前n项和为Sn(Sn不等于0）,满足S

已知数列{an}的前n项和为Sn,且满足Sn=2an-1(n属于正整数),求数列{an}的通项公式an已知数列{an}的前n项和为Sn,且满足Sn=2an-1(n属于正整数),求数列{an}的通项公式