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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| 90 - 82 = | 59 + 31 = | 39 + 17 = | 54 + 36 = |
| 52 - 35 = | 26 + 14 = | 70 - 13 = | 60 - 23 = |
| 91 - 72 = | 60 - 51 = | 47 + 45 = | 82 - 63 = |
| 74 - 49 = | 77 + 15 = | 58 + 16 = | 48 + 44 = |
| 63 + 28 = | 65 - 58 = | 100 - 44 = | 38 + 26 = |
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