數(shù)列的各項(xiàng)均為正數(shù).為其前項(xiàng)和.對(duì)于任意.總有. 查看更多

 

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(09年日照一模)(12分)

已知數(shù)列的各項(xiàng)均為正數(shù),為其前項(xiàng)和,對(duì)于任意的,滿足關(guān)系式

(I)求數(shù)列的通項(xiàng)公式;

(Ⅱ)設(shè)數(shù)列的通項(xiàng)公式是,前項(xiàng)和為,求證:對(duì)于任意的正整數(shù),總有

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數(shù)列的各項(xiàng)均為正數(shù),為其前項(xiàng)和,對(duì)于任意的,總有成等差數(shù)列.

(1)求

(2)求數(shù)列的通項(xiàng)公式;

(3)設(shè)數(shù)列的前項(xiàng)和為,且,求證:對(duì)任意正整數(shù),總有

 

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數(shù)列的各項(xiàng)均為正數(shù),為其前項(xiàng)和,對(duì)于任意,總有成等差數(shù)列.
(1)求數(shù)列的通項(xiàng)公式; 
(2)設(shè)數(shù)列的前項(xiàng)和為,且,求證:對(duì)任意實(shí)數(shù)是常數(shù),和任意正整數(shù),總有
(3)正數(shù)數(shù)列中,求數(shù)列中的最大項(xiàng).

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(本小題滿分14分,第Ⅰ小題5分,第Ⅱ小題4分,第Ⅲ小題5分).

數(shù)列的各項(xiàng)均為正數(shù),為其前項(xiàng)和,對(duì)于任意,總有成等差數(shù)列.

(Ⅰ)求數(shù)列的通項(xiàng)公式;

(Ⅱ)設(shè)數(shù)列的前項(xiàng)和為 ,且,求證:對(duì)任意實(shí)數(shù)是常數(shù),=2.71828)和任意正整數(shù),總有 2;

(Ⅲ) 正數(shù)數(shù)列中,.求數(shù)列中的最大項(xiàng).

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數(shù)列的各項(xiàng)均為正數(shù),為其前項(xiàng)和,對(duì)于任意,總有 成等差數(shù)列。設(shè)數(shù)列的前項(xiàng)和為,且,則對(duì)任意實(shí)數(shù)是常數(shù),)和任意正整數(shù),小于的最小正整數(shù)為(  ▲  )

A.1               B.2               C.3               D.4

 

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