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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| 5.1 - 3.1 = | 8.5 - 3.1 = | 9.1 - 4.1 = | 6.4 - 1.7 = |
| 7.4 - 7.4 = | 1.1 - 0.1 = | 6.4 - 5.5 = | 6.9 - 1.5 = |
| 1.0 - 0.1 = | 7.5 - 2.4 = | 6.5 - 6.2 = | 9.5 - 9.2 = |
| 4.2 - 3.8 = | 8.6 - 1.1 = | 9.5 - 5.0 = | 0.6 - 0.3 = |
| 9.7 - 9.1 = | 9.0 - 3.8 = | 7.4 - 1.8 = | 9.1 - 3.3 = |
| 8.0 - 4.1 = | 7.2 - 2.3 = | 7.7 - 5.6 = | 6.0 - 3.2 = |
| 9.0 - 3.2 = | 7.3 - 4.6 = | 7.5 - 6.9 = | 6.1 - 5.1 = |
| 5.2 - 3.3 = | 9.8 - 3.4 = | 7.4 - 1.7 = | 2.1 - 1.1 = |
| 3.4 - 1.4 = | 9.2 - 8.9 = | 7.7 - 5.0 = | 0.7 - 0.6 = |
| 5.6 - 5.5 = | 9.5 - 7.8 = | 1.4 - 0.2 = | 4.1 - 3.7 = |
| 9.9 - 8.7 = | 9.5 - 7.5 = | 1.3 - 0.5 = | 8.4 - 5.4 = |
| 7.2 - 4.3 = | 9.4 - 1.5 = | 1.9 - 1.4 = | 9.8 - 4.2 = |
| 5.8 - 4.8 = | 9.6 - 8.8 = |
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