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