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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| 51 × 10 = | 15 × 80 = | 12 × 50 = | 78 × 90 = |
| 99 × 20 = | 27 × 80 = | 19 × 50 = | 16 × 50 = |
| 85 × 70 = | 98 × 60 = | 27 × 20 = | 31 × 10 = |
| 82 × 10 = | 53 × 80 = | 39 × 90 = | 28 × 30 = |
| 16 × 10 = | 29 × 90 = | 44 × 30 = | 50 × 20 = |