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