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