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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| 611 - 458 = | 497 + 383 = | 851 - 384 = | 340 - 173 = |
| 945 - 759 = | 552 - 395 = | 362 - 184 = | 921 - 748 = |
| 325 - 249 = | 922 - 899 = | 149 + 489 = | 300 - 211 = |
| 186 + 777 = | 139 + 192 = | 254 + 178 = | 600 - 348 = |
| 945 - 856 = | 259 + 462 = | 778 + 166 = | 586 + 326 = |
| 748 - 389 = | 750 - 676 = | 657 - 189 = | 653 - 368 = |
| 568 + 165 = | 272 + 569 = | 321 - 187 = | 342 - 264 = |
| 198 + 155 = | 198 + 474 = | 275 + 499 = | 601 - 422 = |
| 601 - 384 = | 368 + 579 = | 399 + 422 = | 437 - 288 = |
| 972 - 487 = | 163 + 698 = | 172 + 438 = | 188 + 535 = |
| 850 - 595 = | 863 - 297 = | 750 - 693 = | 376 + 178 = |
| 298 + 562 = | 620 - 195 = | 299 + 611 = | 905 - 199 = |
| 357 + 166 = | 198 + 684 = | 545 + 265 = | 155 + 785 = |
| 639 + 176 = | 473 + 157 = | 163 + 348 = | 740 - 475 = |
消防员爸爸