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