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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| 7.1 - 3.2 = | 5.2 - 2.8 = | 7.0 - 0.6 = | 9.1 - 5.8 = |
| 8.1 - 0.9 = | 2.9 - 2.6 = | 4.2 - 2.7 = | 9.2 - 8.4 = |
| 8.9 - 1.8 = | 7.6 - 0.5 = | 1.3 - 0.4 = | 4.4 - 3.9 = |
| 2.0 - 0.8 = | 6.9 - 2.7 = | 6.6 - 4.1 = | 9.8 - 0.2 = |
| 4.9 - 3.8 = | 0.9 - 0.1 = | 8.5 - 3.7 = | 1.9 - 1.0 = |
| 3.7 - 2.7 = | 8.2 - 1.6 = | 9.8 - 5.9 = | 6.8 - 1.9 = |
| 6.8 - 3.0 = | 5.2 - 2.4 = | 7.4 - 3.5 = | 5.5 - 1.6 = |
| 8.2 - 7.1 = | 6.1 - 4.6 = | 3.5 - 0.7 = | 5.5 - 4.2 = |
| 8.1 - 4.8 = | 8.8 - 6.0 = | 9.3 - 3.5 = | 4.1 - 2.1 = |
| 3.6 - 0.4 = | 3.6 - 1.8 = | 2.3 - 0.7 = | 6.9 - 5.8 = |
| 6.9 - 1.8 = | 9.1 - 7.3 = | 4.2 - 1.9 = | 9.2 - 1.4 = |
| 4.3 - 0.6 = | 8.3 - 0.1 = | 5.9 - 2.1 = | 8.4 - 6.8 = |
| 7.3 - 1.7 = | 8.3 - 3.9 = |
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