93. 400-208, 504-397, 109*6, 205*4, 168*4, 168:4, 648:6, 927:9

Решение:

1. 400 - 208 = 192
2. 504 - 397 = 107
3. 109 × 6 = 654
4. 205 × 4 = 820
5. 168 × 4 = 672
6. 168 : 4 = 42
7. 648 : 6 = 108
8. 927 : 9 = 103