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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| 51 + 49 = | 72 - 28 = | 49 + 42 = | 63 - 55 = |
| 52 + 48 = | 41 - 26 = | 64 + 29 = | 54 + 46 = |
| 48 + 43 = | 54 - 39 = | 91 - 34 = | 33 - 24 = |
| 85 - 76 = | 49 + 44 = | 38 + 17 = | 39 + 33 = |
| 91 - 62 = | 90 - 86 = | 90 - 73 = | 59 + 41 = |