Решение:

а) $$7 \frac{4}{5} \cdot 5 \frac{5}{7} - 4^2 = \frac{39}{5} \cdot \frac{40}{7} - 16 = \frac{39 \cdot 8}{7} - 16 = \frac{312}{7} - 16 = \frac{312 - 112}{7} = \frac{200}{7} = 28 \frac{4}{7}$$ в) $$(10 - 2 \frac{11}{15}) \cdot 11 = (10 - \frac{41}{15}) \cdot 11 = (\frac{150 - 41}{15}) \cdot 11 = \frac{109}{15} \cdot 11 = \frac{1199}{15} = 79 \frac{14}{15}$$ г) $$(8 - 1 \frac{5}{12} \cdot 3) \cdot 25 = (8 - \frac{17}{12} \cdot 3) \cdot 25 = (8 - \frac{17}{4}) \cdot 25 = (\frac{32 - 17}{4}) \cdot 25 = \frac{15}{4} \cdot 25 = \frac{375}{4} = 93 \frac{3}{4}$$

Ответ:

а) $$28 \frac{4}{7}$$ в) $$79 \frac{14}{15}$$ г) $$93 \frac{3}{4}$$