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