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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| 577 - 442 = | 744 - 271 = | 360 - 232 = | 763 - 183 = |
| 202 + 784 = | 202 - 177 = | 149 + 366 = | 203 + 714 = |
| 393 - 357 = | 693 - 105 = | 762 + 212 = | 359 + 559 = |
| 110 - 107 = | 693 + 108 = | 768 - 285 = | 788 + 110 = |
| 928 - 306 = | 110 + 761 = | 115 + 105 = | 216 + 729 = |
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