| 序号 | 题目：1,4,7,8 | |
|---|---|---|
| 1 | ((7 + 1) × 4) − 8 | |
| 2 | ((8 × 4) − 7) − 1 | |
| 3 | ((8 × 4) − 1) − 7 | |
| 4 | (8 × (7 − 4)) × 1 | |
| 5 | (8 × 4) − (7 + 1) | |
| 6 | (8 × 1) × (7 − 4) | |
| 7 | (7 − 1) × (8 − 4) | |
| 8 | 8 × ((7 − 4) × 1) | |
| 9 | 8 × (7 − (4 × 1)) | |
| 10 | 8 × ((7 × 1) − 4) | |
| 11 | (8 ÷ 1) × (7 − 4) | |
| 12 | (8 × (7 − 4)) ÷ 1 | |
| 13 | 8 × ((7 − 4) ÷ 1) | |
| 14 | 8 × ((7 ÷ 1) − 4) | |
| 15 | 8 × (7 − (4 ÷ 1)) | |
| 16 | (7 − 4) ÷ (1 ÷ 8) | |
| 17 | 8 ÷ (1 ÷ (7 − 4)) | |