491. 1) (12 4/5 * 3 3/4 - 4 4/11 * 4 1/8) / (11 2/3 : 2 4/7)

1. Convert mixed numbers to improper fractions: (64/5 * 15/4 - 48/11 * 33/8) / (35/3 : 18/7).
2. Perform multiplication and division: (192/1 - 18/1) / (35/3 * 7/18) = 174 / (35/6).
3. Perform division: 174 * 6/35 = 1044/35 = 29 29/35.