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