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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| 768 - 440 = | 163 + 747 = | 943 - 365 = | 323 - 268 = |
| 167 + 434 = | 419 - 315 = | 627 + 206 = | 435 + 313 = |
| 976 - 524 = | 411 - 286 = | 288 - 257 = | 873 + 115 = |
| 234 + 456 = | 476 + 236 = | 987 - 110 = | 163 - 145 = |
| 865 - 503 = | 172 + 384 = | 135 + 184 = | 216 + 677 = |
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