题干
先化简，再求值：（1﹣
）÷
，其中a=（﹣
）﹣1．
| 3 |
| a |
| + |
| 2 |
| a |
| 2 |
| − |
| 2 |
| a |
| + |
| 1 |
| a |
| 2 |
| − |
| 4 |
| 1 |
| 3 |
答案(点此获取答案解析）
解：原式=
×
| a |
| − |
| 1 |
| a |
| + |
| 2 |
a taxi for me even though I told him I lived nearby.