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