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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| 25 + 25 = | 76 - 28 = | 100 - 83 = | 59 + 39 = |
| 48 + 44 = | 38 + 23 = | 41 - 34 = | 91 - 75 = |
| 49 + 15 = | 48 + 33 = | 69 + 21 = | 98 - 89 = |
| 92 - 85 = | 54 - 35 = | 100 - 99 = | 45 + 28 = |
| 80 - 22 = | 49 + 31 = | 80 - 41 = | 46 + 45 = |
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