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