题干
| 2 |
| 4 |
| + |
| 9 |
| 1 |
| + |
| 1 |
| 2 |
| 1 |
| 3 |
答案(点此获取答案解析）
2
| 2 |
| 4 |
| + |
| 9 |
| 1 |
| + |
| 1 |
| 2 |
| 1 |
| 3 |
