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