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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| 49 + 21 = | 90 - 62 = | 64 + 16 = | 71 - 34 = |
| 39 + 31 = | 48 + 32 = | 55 + 45 = | 80 - 72 = |
| 57 + 43 = | 39 + 39 = | 100 - 86 = | 57 + 28 = |
| 21 - 12 = | 52 - 44 = | 42 - 27 = | 44 + 36 = |
| 90 - 71 = | 20 - 13 = | 97 - 78 = | 59 + 41 = |
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