已知数列{an}{bn}满足2Sn=（an2）bn

已知数列{an}满足an+Sn=n,数列{bn}满足b1=a1,且bn=an-a(n-1),(n≥2）,试求数列{bn}的前n项的和Tn已知数列{an}满足an+Sn=n,数列{bn}满足b1=a1,

已知数列{an}的前n项和sn满足sn=an^2+bn,求证{an}是等差数列已知数列{an}的前n项和sn满足sn=an^2+bn,求证{an}是等差数列已知数列{an}的前n项和sn满足sn=an

已知数列{an}满足sn=n/2,sn是{an}的前项和,a2=11.求sn2.设bn=a（n+1）2^n,求数列{bn}的前N和sn=n/2*an已知数列{an}满足sn=n/2,sn是{an}的前

已知an=2n-1,数列｛bn｝满足：b1/2+b2/2^2+...+bn/2^n=an,求数列{bn}的前n项和Sn已知an=2n-1,数列｛bn｝满足：b1/2+b2/2^2+...+bn/2^n

已知数列{an},{bn}满足a1=2,2an=1+ana(n+1),bn=an-1,设数列{bn}的前n项和为Sn,Tn=S2n-Sn.求数列{bn}的通项公式.已知数列{an},{bn}满足a1=

已知数列an满足a1=2其前n项和为SnSn=n+7~3an数列bn满足bn=an~1证明数列bn是等差数列已知数列an满足a1=2其前n项和为SnSn=n+7~3an数列bn满足bn=an~1证明数

已知数列｛an｝中,a1=1,a(n+1)=2Sn+1(n属于N*),数列｛bn｝中,b1=1,b4=7,且满足b(n+2)+bn=2b(n+1),求数列｛an｝与｛bn｝的通项公式.设Sn是数列｛a

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

已知数列满足an+1-an=2(n属于N*),且a9=17数列{bn}中,bn=3^an,求证数列{bn}是等比数列并...已知数列满足an+1-an=2(n属于N*),且a9=17数列{bn}中,b

已知数列{an}满足a1=3,3a（n+1）=an(n=1,2,3..),设bn=an+log（3）an（n=1,2,3..）则{bn}的前数列和Sn已知数列{an}满足a1=3,3a（n+1）=an

已知正数数列{an},其前n项和Sn满足10Sn=an^2+5an+6,且a1,a3,a15成等比数列,（1）求数列{an}的通项(通项为an=5n-3)（2）设bn=2/[an*a(n+1)],Sn

已知数列{an}成等比,{bn}成等差,且b1=0,数列{cn}满足cn=an+bn,它的前四项依次为1,a,2a,2,求数列｛cn｝的前n项和Sn已知数列{an}成等比,{bn}成等差,且b1=0,

已知数列{an}是等比数列,{bn}是等差数列,且b1=o,数列{cn}满足cn=an+bn,它的前4项依次是1,a,2a,2,求数列{cn}的前n项和Sn已知数列{an}是等比数列,{bn}是等差数

9．已知数列bn前项和Sn=(3/2)n²-1/2n.数列｛an｝满足（1）求数列｛an｝和数列｛bn｝的通项公式；9．已知数列bn前项和Sn=(3/2)n²-1/2n.数列｛an

已知数列{an}满足a1+a/4,(1-an)a(n+1)=1/4,令bn+an-1/2求证数列{1/bn}为等差数列,求和:Sn=a2/a1+a3/a2+...+a(n+1)/an已知数列{an}满

已知数列｛an｝满足a1=1,an=1-1/4a(n-1)(n≥2),设bn=2/2an-1（下标为n),(1)求证：数列｛bn｝是等差数列.（2）数列｛an｝的通项公式（3)若数列｛bn｝的前n项和

已知数列｛an｝、｛bn｝,满足a1=2,2an=1+an×a（n+1）,bn=an-1.求数列｛1／bn｝是等差数列并求数列｛an｝的通项公式（2）令Cn=bnb（n+1）,Sn为数列｛Cn｝的前n

已知数列{an}满足A1=2,An+1=An-1/n(n+1)(1)求数列an的通项公式(2)设{Bn}=nAn*2^n,求数列Bn前n项和SnRT已知数列{an}满足A1=2,An+1=An-1/n

已知数列｛an｝前n项和为sn,且sn=2an-1,数列｛bn｝满足b1=2,bn+1=an+bn求an,b已知数列｛an｝前n项和为sn,且sn=2an-1,数列｛bn｝满足b1=2,bn+1=an

已知数列an满足bn=an-3n,且bn为等比数列,求an前n项和Sn已知数列an满足bn=an-3n,且bn为等比数列,求an前n项和Sn已知数列an满足bn=an-3n,且bn为等比数列,求an前