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