故bn=n(n2-n+1)+×2=n3 查看更多

 

題目列表(包括答案和解析)

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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已知等比數(shù)列{an}的公比為q,記bn=am(n1)1+am(n1)2+…+am(n1)m,cn=am(n1)1·am(n1)2·…·am(n1)m(m,n∈N*),則以下結(jié)論一定正確的是(  )

A.?dāng)?shù)列{bn}為等差數(shù)列,公差為qm

B.?dāng)?shù)列{bn}為等比數(shù)列,公比為q2m

C.?dāng)?shù)列{cn}為等比數(shù)列,公比為qm2

D.?dāng)?shù)列{cn}為等比數(shù)列,公比為qmm

 

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(本小題滿分12分)

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

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

(Ⅰ)求a3a5;

(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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 [番茄花園1] 

已知數(shù)列{an}滿足a1=0,a2=2,且對(duì)任意mnN*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.

 

 

 


 [番茄花園1]1.

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