题目内容

 (本题满分15分)

).

(1)当时,证明:不是奇函数;

(2)设是奇函数,求的值;

 (3)在(2)的条件下,求不等式的解集.

  (本题满分15分)

解:(1)举出反例即可.

,          ………………2分

所以不是奇函数;              ………………4分

(2)是奇函数时,

对定义域内任意实数成立.        ………………6分

化简整理得,这是关于的恒等式,所以

所以 .                 …………9分

经检验符合题意.                             …………10分

(3)由(2)可知                                 ………………11分

得:   ………………13分

                             ………………14分

的解集为                     …………15分

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