已知数列an满足an>0,Sn=[(an+1)/2]^2,bn=(-1)^n*Sn,求b1+b2+……+bn

已知数列{an}中a1=1,且满足an+an-1不等于0,Sn=1/6*(an+1)(an+2).(1)求通项an,并说明{an}是什么数列(2)求数列{an}的前n项和Sn 已知数列{an}中,an>0,前n项和为Sn,且满足Sn=1/8(an+2)^2.求证数列{an}是等差数列. 已知数列An满足An＞0,其前n项和为Sn为满足2Sn=An的平方+An(1)求An(2)设数列Bn满足An/2的n次方,Tn=b1+b2+ 已知数列{an},满足a1=1/2,Sn=n²×an,求an 已知数列{an}满足a1=1/2,sn=n^2an,求通项an 已知数列an满足a1=1/2 sn=n平方×an 求an 已知数列An满足 A1=1/2 Sn=N²An 求An 已知数列an满足a1=1 Sn=2an+n 求an 已知数列{an}满足Sn+an=2n+1.求an 三校生数学,an和sn的关系.已知数列{an}中,an>0,前n项之和为An,且满足An三校生数学,an和sn的关系.已知数列{an}中,an>0,前n项之和为An,且满足An=1/8(an+2)²,求数列{an} 已知数列{an}满足:a1=3,an=Sn-1+2n,求数列an及sn 一个数列问题已知数列an前n项为sn,满足an+sn=2n.求an 已知数列{an}中,an>0,s=a1+a2+.+an,且an=6sn/(an+3),求sn 已知数列{an}满足a1=0,a2=1,an+2=3an+1-2an,则{an}的前n项和Sn=（ ） “已知数列{an}中,an>0,Sn是数列{An}中的前n项和,且An+1/An=2Sn”An>0,求An 已知数列{an}满足,a1=2,a(n+1)=3根号an,求通项an数列{an}满足:an>0,且根号下Sn=an+1/4,求通项an 已知数列 an＞0 an+1/an=2Sn 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.