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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| 259 - 152 + 598 = | 392 + 249 - 435 = | 444 + 104 - 130 = | 197 - 139 + 639 = |
| 490 + 181 - 534 = | 446 + 474 - 782 = | 305 - 237 + 293 = | 850 - 271 - 327 = |
| 817 - 417 - 226 = | 366 + 517 - 529 = | 743 + 246 - 623 = | 756 - 229 - 492 = |
| 317 - 106 + 278 = | 900 - 563 + 642 = | 715 - 227 + 301 = | 271 + 341 + 384 = |
| 734 - 323 + 499 = | 176 - 115 + 452 = | 701 - 105 - 560 = | 775 + 102 - 515 = |
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