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