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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| 2.7 - 1.9 = | 5.7 + 3.1 = | 7.2 - 1.9 = | 5.7 - 3.1 = |
| 8.5 - 7.7 = | 1.5 + 2.5 = | 0.9 + 2.6 = | 3.9 + 2.0 = |
| 3.2 + 2.1 = | 7.2 + 1.9 = | 3.1 + 7.5 = | 9.3 + 1.6 = |
| 6.2 + 4.5 = | 2.6 + 3.7 = | 4.0 - 2.9 = | 2.6 - 1.1 = |
| 2.0 + 9.1 = | 8.1 - 5.2 = | 8.5 + 7.7 = | 7.7 - 1.8 = |
| 8.0 - 5.3 = | 5.4 - 5.0 = | 6.2 - 4.5 = | 3.2 - 2.1 = |
| 4.3 + 3.0 = | 8.8 + 5.6 = | 5.4 + 5.0 = | 9.9 - 2.4 = |
| 8.8 - 5.6 = | 3.8 + 4.6 = | 4.3 - 3.0 = | 8.6 - 1.4 = |
| 9.3 - 1.6 = | 7.7 + 1.8 = | 8.9 + 0.6 = | 4.8 + 7.6 = |
| 9.2 + 9.8 = | 5.6 - 5.1 = | 3.9 - 2.0 = | 5.1 + 7.1 = |
| 2.7 + 1.9 = | 3.3 + 5.8 = | 2.6 + 1.1 = | 6.7 - 1.1 = |
| 8.9 - 0.6 = | 5.1 - 4.0 = | 2.3 - 0.8 = | 8.0 - 0.9 = |
| 1.3 + 2.7 = | 6.6 - 6.4 = |
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