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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| 1 + 4 × 9 = | 3 × 6 - 9 = | 9 × 6 - 7 = | 1 + 5 × 7 = |
| 7 × 4 + 6 = | 1 + 4 × 9 = | 9 + 7 × 9 = | 7 × 9 + 5 = |
| 7 × 2 - 5 = | 9 + 4 × 8 = | 7 + 8 × 2 = | 8 + 5 × 8 = |
| 7 + 6 × 2 = | 8 × 6 + 5 = | 3 × 6 + 5 = | 9 + 9 × 4 = |
| 3 × 7 + 8 = | 9 × 4 + 4 = | 9 × 3 - 1 = | 5 × 8 + 5 = |
| 6 × 9 - 7 = | 6 × 5 - 6 = | 8 × 9 + 9 = | 7 × 2 + 2 = |
| 8 × 9 + 4 = | 4 × 5 - 6 = | 9 × 6 + 7 = | 9 + 6 × 2 = |
| 6 × 6 - 4 = | 9 × 4 - 6 = | 5 × 2 - 5 = | 5 + 8 × 7 = |
| 6 × 9 + 4 = | 6 × 7 + 6 = | 8 + 3 × 5 = | 7 × 4 + 7 = |
| 7 + 3 × 5 = | 8 × 6 - 8 = | 1 + 5 × 2 = | 7 × 8 - 4 = |
| 6 × 2 + 2 = | 5 × 7 - 1 = | 5 × 9 + 2 = | 3 × 7 - 9 = |
| 4 + 9 × 9 = | 3 × 5 + 1 = | 7 + 4 × 5 = | 9 × 3 - 2 = |
| 7 + 9 × 7 = | 5 + 3 × 9 = |
消防员爸爸