(II)設(shè)有且僅有一個(gè)實(shí)數(shù).使得.求函數(shù)的解析表達(dá)式 查看更多

 

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(22)設(shè),對(duì)任意實(shí)數(shù),記.

(I)求函數(shù)的單調(diào)區(qū)間;

(II)求證:(。┊(dāng)時(shí),對(duì)任意正實(shí)數(shù)成立;

(ⅱ)有且僅有一個(gè)正實(shí)數(shù),使得對(duì)任意正實(shí)數(shù)成立.

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設(shè),對(duì)任意實(shí)數(shù),記

(I)求函數(shù)的單調(diào)區(qū)間;

(II)求證:

()當(dāng)時(shí),對(duì)任意正實(shí)數(shù)成立;

()有且僅有一個(gè)正實(shí)數(shù),使得對(duì)任意正實(shí)數(shù)成立.

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(本題15分)設(shè),對(duì)任意實(shí)數(shù),記

(I)求函數(shù)的單調(diào)區(qū)間;

(II)求證:(ⅰ)當(dāng)時(shí),對(duì)任意正實(shí)數(shù)成立;

(ⅱ)有且僅有一個(gè)正實(shí)數(shù),使得對(duì)任意正實(shí)數(shù)成立.

 

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設(shè),對(duì)任意實(shí)數(shù)t,記
(I)求函數(shù)y=f(x)-g8(x)的單調(diào)區(qū)間;
(II)求證:(。┊(dāng)x>0時(shí),f(x)≥gt(x)對(duì)任意正實(shí)數(shù)t成立;
(ⅱ)有且僅有一個(gè)正實(shí)數(shù)x,使得g8(x)≥gt(x)對(duì)任意正實(shí)數(shù)t成立.

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(07年浙江卷理)(15分)設(shè),對(duì)任意實(shí)數(shù),記

(I)求函數(shù)的單調(diào)區(qū)間;

(II)求證:()當(dāng)時(shí),對(duì)任意正實(shí)數(shù)成立;

()有且僅有一個(gè)正實(shí)數(shù),使得對(duì)任意正實(shí)數(shù)成立.

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