跟着消防员爸爸学习C++编程与算法（请备注算法学习）
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| 3 × 7 + 4 = | 2 + 2 × 8 = | 7 × 4 + 9 = | 7 + 3 × 6 = |
| 6 + 9 × 8 = | 4 × 6 - 9 = | 5 + 6 × 8 = | 7 + 8 × 8 = |
| 5 + 7 × 4 = | 5 × 6 + 4 = | 7 × 8 - 7 = | 6 × 2 - 3 = |
| 8 × 3 - 9 = | 8 × 9 - 3 = | 4 × 9 + 5 = | 5 × 2 + 9 = |
| 5 × 4 - 4 = | 3 × 4 - 9 = | 5 + 4 × 7 = | 5 + 3 × 4 = |
| 6 × 7 + 9 = | 5 × 7 + 3 = | 5 + 7 × 7 = | 6 × 9 + 2 = |
| 2 × 9 + 3 = | 6 × 9 + 6 = | 6 + 7 × 7 = | 2 × 7 - 5 = |
| 9 × 4 - 5 = | 5 × 4 + 9 = | 5 + 2 × 6 = | 9 × 3 - 1 = |
| 3 × 5 - 7 = | 6 × 6 - 4 = | 2 + 3 × 9 = | 3 × 6 + 4 = |
| 5 + 8 × 7 = | 3 × 7 - 4 = | 4 × 6 - 2 = | 3 × 4 + 2 = |
| 5 × 2 + 7 = | 6 × 8 - 4 = | 9 × 4 + 1 = | 3 × 4 - 6 = |
| 8 × 3 - 2 = | 7 × 3 - 6 = | 2 × 7 - 7 = | 3 + 8 × 9 = |
| 2 × 5 + 5 = | 8 × 5 - 5 = |
消防员爸爸