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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| 7.6 - 2.7 = | 8.9 - 6.8 = | 4.7 + 7.5 = | 9.1 - 2.1 = |
| 2.6 + 8.8 = | 6.5 - 5.6 = | 8.3 - 7.0 = | 9.5 - 8.7 = |
| 8.5 - 4.2 = | 7.3 - 1.8 = | 7.5 - 6.3 = | 7.5 + 6.3 = |
| 3.2 + 0.6 = | 7.5 + 0.6 = | 8.6 + 8.0 = | 2.2 + 7.0 = |
| 2.4 - 1.5 = | 8.0 - 5.8 = | 1.9 - 1.5 = | 8.7 - 1.8 = |
| 8.7 - 2.1 = | 7.3 + 1.8 = | 8.0 + 5.8 = | 8.7 + 1.8 = |
| 3.4 - 0.5 = | 5.0 + 7.2 = | 4.8 + 9.2 = | 7.9 - 4.3 = |
| 7.5 - 0.6 = | 3.2 - 0.6 = | 0.3 + 3.9 = | 9.8 - 5.1 = |
| 9.8 + 5.1 = | 5.7 - 1.4 = | 8.6 - 8.0 = | 1.1 + 4.4 = |
| 7.4 - 3.4 = | 7.1 + 6.9 = | 4.4 + 5.1 = | 6.5 + 5.6 = |
| 5.6 - 1.7 = | 1.9 + 1.5 = | 7.1 - 6.9 = | 2.4 + 1.5 = |
| 8.1 - 3.2 = | 5.7 + 1.4 = | 3.4 + 0.5 = | 1.1 + 5.5 = |
| 8.5 + 4.2 = | 1.0 + 3.8 = |
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