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