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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| 3000 + 400 = | 8800 - 8000 = | 4000 + 100 = | 800 + 1000 = |
| 2900 - 2000 = | 3900 - 3000 = | 700 + 1000 = | 7800 - 800 = |
| 2300 - 300 = | 3000 + 100 = | 2700 - 700 = | 400 + 1000 = |
| 1000 + 500 = | 700 + 1000 = | 300 + 4000 = | 1900 - 1000 = |
| 500 + 2000 = | 7000 + 100 = | 2700 - 2000 = | 6800 - 6000 = |
| 5000 + 200 = | 7000 + 100 = | 7500 - 7000 = | 500 + 4000 = |
| 1000 + 500 = | 300 + 1000 = | 3900 - 900 = | 100 + 5000 = |
| 100 + 1000 = | 8900 - 8000 = | 1900 - 900 = | 2000 + 200 = |
| 8000 + 100 = | 200 + 2000 = | 1200 - 1000 = | 400 + 1000 = |
| 2900 - 900 = | 6800 - 800 = | 3200 - 200 = | 6800 - 800 = |
| 1000 + 100 = | 100 + 5000 = | 1200 - 200 = | 6800 - 6000 = |
| 8900 - 900 = | 7500 - 500 = | 5000 + 400 = | 2300 - 2000 = |
| 7800 - 7000 = | 8800 - 800 = |
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