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