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