题目内容

(本题满分15分)

已知函数

(1)求的单调区间;

(2)设,若上不单调且仅在处取得最大值,求的取值范围.

 

【答案】

解:(1)---------2分

        若,则,所以此时只有递增区间(---------4分

        若,当

                   

            所以此时递增区间为:(,递减区间为:(0,-------------6分

       (2),设

           若上不单调,则X。K]

            -------------10分

同时仅在处取得最大值,即可

            得出:----------14分    的范围:---15分

 

【解析】略

 

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