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