函數(shù)的定義域?yàn)?img width=16 height=17 src="http://thumb.1010pic.com/pic1/1899/sx/139/50539.gif" >,并滿足條件

① 對(duì)任意,有;

② 對(duì)任意,有;

(1)求的值;

(2)求證:上是單調(diào)遞增函數(shù);

(3)若,且,求證

1


解析:

解法一:(1)令,則                                                                  

                                                                                                               

(2)任取,且

設(shè),則

                                                                                                                  ,上是單調(diào)遞增函數(shù)                                                       

(3)由(1)(2)知                                                              

                                                                                         

         又                                                                                                                                           

解法二:(1)對(duì)任意,有

                                                                                                       

當(dāng)時(shí),                                                                                                ,,                                                                                     

(2),                                                             

上的單調(diào)增函數(shù)

上是單調(diào)遞增函數(shù)                                                                                              

(3)                                                                

,                                         

                                                                                                                      

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