题目内容

(14分)已知定义在R上函数是奇函数.

(1)对于任意不等式恒成立, 求的取值范围.

(2)若对于任意实数,m,x,恒成立,求t的取值范围.

(3)若是定义在R上周期为2的奇函数,且当时,,求的所有解

(1)∵为奇函数,即        ∴  

                                                                    ·····(2分)

易证在R上单调递减                                                                        ·····(3分)

恒成立

                                                                                                 ·····(5分)

(2)由单减可知

恒成立

∴只需                                                                       ·····(7分)

恒成立

                    ∴                                                    ·····(9分)

(3)∵为奇函数  

的周期为       ∴

                                                                                    ·····(10分)

为单调递减 

                                                                                               ·····(11分)

由g(x)的周期为2,所有解为                                              ·····(14分)

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