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