設(shè)數(shù)列{an}滿足a1++-+=a2n-1,{an}的前n項(xiàng)和為Sn(a>0,a≠1,n∈N*). (1)求an; (2)求, (3)求證:(n+2)(n+1)an+n(n+2)an+1<2n(n+1)an+2 查看更多

 

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已知數(shù)列{an}滿足:a1=1,an+1

(1)求a2,a3

(2)設(shè)bn=a2n+1+4n-2,n∈N*,求證:數(shù)列{bn}是等比數(shù)列,并求其通項(xiàng)公式;

(3)求數(shù)列{an}前100項(xiàng)中的所有奇數(shù)項(xiàng)的和S.

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已知數(shù)列{an}與{bn}滿足:,n∈N*且a1=2.

(Ⅰ)求a2,a3的值

(Ⅱ)設(shè)Cn=a2n+1-a2n-1,n∈N*證明{Cn}是等比數(shù)列;

(Ⅲ)設(shè)Sn為{an}的前n項(xiàng)和,證明:

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已知數(shù)列{an}滿足a1=0,a2=2,且對(duì)任意m、nN*都有
a2m1a2n1=2amn1+2(mn)2
(Ⅰ)求a3,a5
(Ⅱ)設(shè)bna2n1a2n1(nN*),證明:{bn}是等差數(shù)列;
(Ⅲ)設(shè)cn=(an+1an)qn1(q≠0,nN*),求數(shù)列{cn}的前n項(xiàng)和Sn.

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已知數(shù)列{an}滿足a1=0,a2=2,且對(duì)任意m、nN*都有

a2m-1a2n-1=2amn-1+2(mn)2

(Ⅰ)求a3,a5

(Ⅱ)設(shè)bna2n+1a2n-1(nN*),證明:{bn}是等差數(shù)列;

(Ⅲ)設(shè)cn=(an+1an)qn-1(q≠0,nN*),求數(shù)列{cn}的前n項(xiàng)和Sn.

 

 

 

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已知數(shù)列{an}滿足a1=0,a2=2,且對(duì)任意m、nN*都有
a2m1a2n1=2amn1+2(mn)2
(Ⅰ)求a3a5;
(Ⅱ)設(shè)bna2n1a2n1(nN*),證明:{bn}是等差數(shù)列;
(Ⅲ)設(shè)cn=(an+1an)qn1(q≠0,nN*),求數(shù)列{cn}的前n項(xiàng)和Sn.

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