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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| 400 + 4000 = | 2000 + 400 = | 1300 - 1000 = | 3000 + 400 = |
| 1800 - 800 = | 4400 - 400 = | 1900 - 1000 = | 500 + 1000 = |
| 9600 - 9000 = | 6400 - 400 = | 2000 + 400 = | 300 + 4000 = |
| 3800 - 3000 = | 8900 - 8000 = | 100 + 3000 = | 3800 - 800 = |
| 4000 + 400 = | 100 + 7000 = | 1000 + 700 = | 5900 - 5000 = |
| 100 + 1000 = | 3000 + 400 = | 100 + 4000 = | 1900 - 900 = |
| 5900 - 900 = | 1800 - 1000 = | 2800 - 2000 = | 1000 + 300 = |
| 500 + 2000 = | 2600 - 2000 = | 600 + 1000 = | 5000 + 100 = |
| 1300 - 300 = | 300 + 4000 = | 200 + 4000 = | 1000 + 100 = |
| 4400 - 4000 = | 9600 - 600 = | 200 + 4000 = | 6400 - 6000 = |
| 2600 - 600 = | 2800 - 800 = | 100 + 1000 = | 4800 - 800 = |
| 8900 - 900 = | 4800 - 4000 = | 5600 - 600 = | 1000 + 400 = |
| 1000 + 100 = | 6000 + 100 = |
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