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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| 525 + 435 = | 720 - 179 = | 746 - 336 = | 257 - 148 = |
| 823 - 685 = | 257 + 376 = | 221 + 249 = | 525 - 258 = |
| 108 + 279 = | 719 + 215 = | 187 - 185 = | 341 + 354 = |
| 424 + 279 = | 368 - 331 = | 934 - 187 = | 263 + 499 = |
| 196 + 380 = | 270 - 161 = | 535 - 447 = | 269 + 423 = |
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