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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| 5.5 - 4.5 = | 5.5 - 2.0 = | 9.0 - 8.1 = | 8.8 - 4.2 = |
| 9.0 - 5.1 = | 8.1 - 3.0 = | 7.8 - 5.4 = | 7.0 - 5.6 = |
| 9.5 - 3.3 = | 4.6 - 1.3 = | 6.8 - 4.3 = | 9.1 - 5.8 = |
| 6.2 - 4.7 = | 8.8 - 6.3 = | 3.7 - 0.3 = | 9.5 - 5.5 = |
| 8.1 - 2.4 = | 2.0 - 0.3 = | 7.5 - 0.5 = | 4.6 - 3.5 = |
| 1.9 - 1.1 = | 6.0 - 5.0 = | 9.8 - 3.5 = | 6.7 - 0.6 = |
| 8.9 - 4.8 = | 9.3 - 0.9 = | 8.5 - 6.0 = | 7.8 - 5.1 = |
| 7.8 - 0.2 = | 6.5 - 3.7 = | 8.8 - 0.1 = | 8.7 - 1.8 = |
| 9.4 - 5.4 = | 4.8 - 1.9 = | 9.3 - 0.1 = | 2.1 - 0.5 = |
| 8.5 - 2.0 = | 8.6 - 8.4 = | 6.6 - 0.8 = | 4.0 - 1.9 = |
| 9.1 - 4.4 = | 5.0 - 2.8 = | 5.4 - 3.6 = | 8.8 - 3.6 = |
| 6.2 - 0.4 = | 6.6 - 5.9 = | 2.0 - 1.1 = | 5.0 - 0.1 = |
| 7.5 - 3.3 = | 7.0 - 3.6 = |
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