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