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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| 970 - 286 = | 357 + 467 = | 275 - 245 = | 609 + 113 = |
| 933 - 704 = | 156 + 166 = | 186 + 709 = | 467 + 465 = |
| 394 + 398 = | 619 - 367 = | 609 - 107 = | 155 - 134 = |
| 155 + 668 = | 272 - 235 = | 468 - 249 = | 254 + 457 = |
| 186 - 158 = | 487 + 352 = | 315 + 142 = | 990 - 479 = |
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