函數(shù)的定義域?yàn)?img src="http://thumb.zyjl.cn/pic2/upload/papers/20140823/20140823130851926206.gif" style="vertical-align:middle;" />,并滿足條件
①對任意,有
②對任意,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,                                                              
                                                                                        
                                                                                                                                         
解法二:(1)對任意,有
                                                                                                       
當(dāng)時,                                                                                               ,                                                                                    
(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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