Решение:
1) (318 * 207 – 64 934) * 276 + 604 * 88:
- 318 * 207 = 65726
- 65726 – 64934 = 792
- 792 * 276 = 218592
- 604 * 88 = 53152
- 218592 + 53152 = 271744
2) 869 * (61 124 – 488 * 125) – 509 * 74:
- 488 * 125 = 61000
- 61124 – 61000 = 124
- 869 * 124 = 107756
- 509 * 74 = 37666
- 107756 – 37666 = 70090