（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．

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（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．

答案

解：（Ⅰ）                                
， 2                                                                                                                                                                                                                                                                                                                                                                                                           
所以．                            
（Ⅱ）当（）时，的最大值是．                 
由，，
得，．
所以的单调递增区间为，．

解析

略