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