题干
设函数f（x）=
（a＞0且a≠1）是定义域为R的奇函数．
| a |
| 2 |
| x |
| − |
| t |
| − |
| 1 |
| a |
| x |
| a |
| 2 |
| x |
| − |
| t |
| − |
| 1 |
| a |
| x |
