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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| 6.0 - 4.2 = | 4.6 - 2.5 = | 8.0 - 0.5 = | 7.3 - 5.7 = |
| 6.6 - 6.4 = | 9.4 - 5.5 = | 9.9 - 2.2 = | 8.7 - 3.8 = |
| 3.5 - 2.0 = | 7.4 - 1.5 = | 6.4 - 4.0 = | 9.9 - 4.7 = |
| 6.6 - 6.0 = | 6.0 - 2.1 = | 9.6 - 3.8 = | 7.3 - 5.6 = |
| 8.2 - 3.5 = | 7.3 - 3.0 = | 7.0 - 4.8 = | 7.2 - 5.8 = |
| 5.8 - 2.0 = | 7.3 - 2.2 = | 6.2 - 2.0 = | 9.2 - 0.2 = |
| 6.9 - 4.9 = | 9.5 - 1.3 = | 7.0 - 0.8 = | 4.8 - 4.0 = |
| 5.8 - 1.5 = | 5.3 - 4.3 = | 9.2 - 6.0 = | 9.6 - 3.2 = |
| 7.5 - 4.5 = | 7.8 - 2.3 = | 9.8 - 1.9 = | 9.4 - 7.7 = |
| 7.6 - 3.4 = | 3.0 - 1.6 = | 8.9 - 0.8 = | 7.4 - 5.2 = |
| 6.5 - 1.4 = | 8.3 - 3.0 = | 9.3 - 3.9 = | 5.3 - 5.2 = |
| 2.5 - 2.4 = | 8.2 - 5.7 = | 8.0 - 0.8 = | 6.3 - 5.1 = |
| 6.1 - 3.7 = | 8.5 - 8.2 = |
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