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