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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| 4.9 - 1.8 = | 8.3 - 3.2 = | 5.1 - 3.9 = | 2.9 - 0.3 = |
| 1.1 - 0.6 = | 1.5 - 0.2 = | 8.3 - 8.2 = | 3.8 - 1.9 = |
| 8.5 - 7.4 = | 9.0 - 6.0 = | 5.4 - 1.4 = | 8.0 - 3.7 = |
| 6.3 - 5.3 = | 3.2 - 2.4 = | 0.6 - 0.2 = | 4.4 - 2.8 = |
| 3.2 - 0.3 = | 3.3 - 0.2 = | 3.7 - 1.1 = | 1.4 - 0.5 = |
| 1.5 - 0.4 = | 8.0 - 4.0 = | 8.7 - 0.4 = | 9.0 - 4.0 = |
| 7.6 - 6.4 = | 7.9 - 3.5 = | 6.0 - 1.3 = | 8.1 - 7.8 = |
| 8.2 - 5.0 = | 6.1 - 3.1 = | 2.0 - 1.8 = | 2.1 - 0.8 = |
| 7.9 - 1.8 = | 6.4 - 1.5 = | 5.3 - 4.4 = | 7.3 - 3.7 = |
| 8.4 - 6.0 = | 2.0 - 1.4 = | 9.7 - 7.0 = | 9.6 - 3.8 = |
| 9.6 - 6.2 = | 9.8 - 9.2 = | 9.6 - 1.8 = | 7.2 - 3.2 = |
| 8.2 - 4.6 = | 5.9 - 5.3 = | 7.8 - 6.2 = | 7.8 - 0.6 = |
| 9.8 - 3.1 = | 6.5 - 4.7 = |
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