题干
已知 x +
=2 ，那么
| 1 |
| x |
| x |
| x |
| 2 |
| + |
| 3 |
| x |
| + |
| 1 |
| x |
| x |
| 2 |
| − |
| x |
| + |
| 1 |
答案(点此获取答案解析）
| 5 |
| 5 |
