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