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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| 6 × 7 = | 7 × 2 = | 2 × 3 = | 5 × 8 = |
| 7 × 3 = | 6 × 9 = | 5 × 5 = | 8 × 7 = |
| 2 × 1 = | 8 × 9 = | 9 × 2 = | 1 × 7 = |
| 7 × 7 = | 2 × 9 = | 4 × 8 = | 5 × 1 = |
| 9 × 1 = | 1 × 1 = | 7 × 5 = | 7 × 8 = |
| 6 × 6 = | 8 × 4 = | 3 × 9 = | 6 × 5 = |
| 1 × 4 = | 8 × 6 = | 5 × 3 = | 4 × 4 = |
| 6 × 4 = | 7 × 1 = | 4 × 1 = | 5 × 9 = |
| 5 × 4 = | 3 × 2 = | 7 × 4 = | 2 × 7 = |
| 3 × 3 = | 9 × 3 = | 3 × 8 = | 1 × 8 = |
| 9 × 8 = | 9 × 9 = | 6 × 8 = | 1 × 5 = |
| 4 × 7 = | 1 × 6 = | 8 × 5 = | 5 × 2 = |
| 8 × 3 = | 3 × 7 = |
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