這就是說(shuō)猜想也成立,故對(duì)任意正整數(shù)都有. 查看更多

 

題目列表(包括答案和解析)

設(shè)函數(shù)f(x)=x2-2(-1)klnx(k∈N*),f′(x)表示f(x)的導(dǎo)函數(shù).
(1)求函數(shù)y=f(x)的單調(diào)增區(qū)間;
(2)當(dāng)k為偶數(shù)時(shí),數(shù)列{an}滿足:a1=1,anf′(an)=an+12-3.證明:數(shù)列{an2}中的任意三項(xiàng)不能構(gòu)成等差數(shù)列;
(3)當(dāng)k為奇數(shù)時(shí),證明:對(duì)任意正整數(shù)都有[f′(x)]n-2n-1f′(xn)≥2n(2n-2)成立.

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(2009四川卷文)(本小題滿分14分)

設(shè)數(shù)列的前項(xiàng)和為,對(duì)任意的正整數(shù),都有成立,記。                                       

(I)求數(shù)列與數(shù)列的通項(xiàng)公式;

(II)設(shè)數(shù)列的前項(xiàng)和為,是否存在正整數(shù),使得成立?若存在,找出一個(gè)正整數(shù);若不存在,請(qǐng)說(shuō)明理由;

(III)記,設(shè)數(shù)列的前項(xiàng)和為,求證:對(duì)任意正整數(shù)都有;

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(本小題滿分14分)

設(shè)數(shù)列的前項(xiàng)和為,對(duì)任意的正整數(shù),都有成立,記

(I)求數(shù)列的通項(xiàng)公式;

(II)記,設(shè)數(shù)列的前項(xiàng)和為,求證:對(duì)任意正整數(shù)都有;

(III)設(shè)數(shù)列的前項(xiàng)和為。已知正實(shí)數(shù)滿足:對(duì)任意正整數(shù)恒成立,求的最小值。

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設(shè)數(shù)列的前項(xiàng)和為,對(duì)任意的正整數(shù),都有成立,記

(I)求數(shù)列的通項(xiàng)公式;

(II)記,設(shè)數(shù)列的前項(xiàng)和為,求證:對(duì)任意正整數(shù)都有;

(III)設(shè)數(shù)列的前項(xiàng)和為。已知正實(shí)數(shù)滿足:對(duì)任意正整數(shù)恒成立,求的最小值。

 

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已知函數(shù),若數(shù)列滿足,且對(duì)任意正整數(shù)都有成立,則實(shí)數(shù)的取值范圍是(   )

A.           B.           C.            D.

 

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