| 序号 | 题目：1,8,9,12 | |
|---|---|---|
| 1 | (8 × 1) × (12 − 9) | |
| 2 | (8 × (12 − 9)) × 1 | |
| 3 | 8 × ((12 × 1) − 9) | |
| 4 | 8 × (12 − (9 × 1)) | |
| 5 | 8 × ((12 − 9) × 1) | |
| 6 | 12 × ((9 + 1) − 8) | |
| 7 | 12 × (9 − (8 − 1)) | |
| 8 | 12 × (1 + (9 − 8)) | |
| 9 | (8 ÷ 1) × (12 − 9) | |
| 10 | (8 × (12 − 9)) ÷ 1 | |
| 11 | 8 × ((12 ÷ 1) − 9) | |
| 12 | 8 × (12 − (9 ÷ 1)) | |
| 13 | 8 × ((12 − 9) ÷ 1) | |
| 14 | (12 − 9) ÷ (1 ÷ 8) | |
| 15 | 8 ÷ ((12 ÷ 9) − 1) | |
| 16 | 8 ÷ (1 ÷ (12 − 9)) | |