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