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