已知数列{an}{bn}满足2Sn=（an+2）bn

an=2*3^n-1若数列bn满足bn=an+（-1）^n*ln（an）,求数列bn前n项和Snan=2*3^n-1若数列bn满足bn=an+（-1）^n*ln（an）,求数列bn前n项和Snan=2

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

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}、{bn}满足:a1=1/4,an+bn=1,bn+1=bn/1-an^2（1）求{an}的通项公式已知数列{an}、{bn}满足:a1=1/4,an+bn=1,bn+1=bn/1-a

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｛an｝为等比数列且an=2*3^(n-1)即首项2公比3若数列｛bn｝满足bn=an+（(-1)^n）*ln(an)求数列{bn}的前n项和Sn已知｛an｝为等比数列且an=2*3^(n-1)即

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｝的前n项和Sn=2^n,数列｛bn｝满足b1=-1,bn+1=bn+（2n-1）（1）求数列｛An｝的通项An（2）求数列｛Bn｝的通项Bn（3）若Cn=An•Bn/n,求

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+

已知函数f(x)=x/2x+1,x>0,数列{an}满足a1=1,an+1=f(an)；数列{bn}满足b1=1/2,bn+1=1/1-2f（Sn）,其中已知函数f(x)=x/2x+1，x>0，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}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

已知数列｛an｝的前n项和为Sn=4n^2-2n.n属于N+（1）求an(2)若bn满足an=2(log2)bn,求数列bn的前n项和已知数列｛an｝的前n项和为Sn=4n^2-2n.n属于N+（1）

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

（1）若两等差数列{an},{bn}的前n项和分别为An,Bn,满足An/Bn=（7n+1）/（4n+27）,则a11/b11的值为（）（2）已知等比数列｛an},首项为81,数列{bn}满足bn=l

已知数列an的前n项和为sn,满足an+sn=2n,记bn=2-an,求证bn是等比数列,并求bn的前n项和Bn已知数列an的前n项和为sn,满足an+sn=2n,记bn=2-an,求证bn是等比数列

已知数列{bn}前n项和Sn=3/2n^2-1/2n.数列{an}满足(an)^3=4^-(bn+2)(n∈N*）,数列{cn}=anbn求数列{cn}已知数列{bn}前n项和Sn=3/2n^2-1/

数列已知数列an的前n项和为Sn,满足Sn=2an-2n（n属于自然数集）（1)求证：数列an+2为等比数列（2）若数列bn满足bn=log(2)(an+2)Tn为数列bn/（an+2)的前n项和,求