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