题目内容

(本小题满分13分)
已知函数
(Ⅰ)求的值;
(Ⅱ)求的最大值及单调递增区间.
解:(Ⅰ)                                
, 2                                                                                                                                                                                                                                                                                                                                                                                                           
所以.                            
(Ⅱ)当)时,的最大值是.                 


所以的单调递增区间为
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