题目内容

设函数有正的极大值和负的极小值,其差为4,
(1)求实数的值;
(2)求的取值范围.
(1)(2)
(1)
           得                             (2分)
   (4分)
                                                                                                                               (6分)
(2)当时,







+
0

0
+
得:                                                 (8分)
         得:                                                                                (9分)
同理当时,







+
0

0
+
得:                                                                                   (11分)
得                                                                                                        (12分)
得:时,得(14分)(结论2分)
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