| 序号 | 题目:2,2,9,11 | |
|---|---|---|
| 1 | ((9 + 2) + 2) + 11 | |
| 2 | ((11 + 9) + 2) + 2 | |
| 3 | ((11 + 2) + 9) + 2 | |
| 4 | ((11 + 2) + 2) + 9 | |
| 5 | (11 + 9) + (2 + 2) | |
| 6 | (11 + 2) + (9 + 2) | |
| 7 | (11 + (2 + 2)) + 9 | |
| 8 | (9 + (2 + 2)) + 11 | |
| 9 | (11 + 9) + (2 × 2) | |
| 10 | (9 + (2 × 2)) + 11 | |
| 11 | (11 + (2 × 2)) + 9 | |
| 12 | (11 + (9 + 2)) + 2 | |