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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| 6.0 - 2.1 = | 2.7 - 0.6 = | 9.3 - 0.1 = | 7.4 - 1.0 = |
| 8.1 - 7.8 = | 7.9 - 1.3 = | 8.3 - 6.4 = | 5.4 - 5.1 = |
| 2.3 - 0.3 = | 9.5 - 9.0 = | 8.2 - 4.4 = | 4.5 - 4.1 = |
| 6.7 - 4.7 = | 7.3 - 3.0 = | 7.1 - 0.8 = | 9.3 - 3.6 = |
| 6.4 - 2.9 = | 5.0 - 4.1 = | 7.1 - 2.6 = | 5.0 - 1.4 = |
| 8.7 - 1.1 = | 6.3 - 5.8 = | 7.0 - 4.1 = | 8.7 - 1.0 = |
| 7.6 - 4.9 = | 2.7 - 0.5 = | 5.1 - 1.9 = | 9.3 - 4.6 = |
| 3.9 - 1.7 = | 2.5 - 1.7 = | 0.7 - 0.6 = | 7.2 - 2.6 = |
| 3.6 - 3.4 = | 5.9 - 5.7 = | 2.1 - 1.8 = | 4.5 - 0.8 = |
| 7.5 - 0.2 = | 7.9 - 0.9 = | 8.1 - 0.6 = | 5.8 - 0.2 = |
| 5.4 - 1.1 = | 9.4 - 8.9 = | 8.3 - 4.3 = | 5.9 - 3.4 = |
| 5.4 - 4.0 = | 3.5 - 3.1 = | 3.8 - 1.0 = | 8.3 - 2.0 = |
| 0.3 - 0.3 = | 5.2 - 1.6 = |
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