Решение:
- а) \( \frac{9}{32} \times \frac{4}{27} = \frac{9 \times 4}{32 \times 27} = \frac{36}{864} = \frac{1}{24} \)
- б) \( 8,5 \times \frac{5}{17} = \frac{85}{10} \times \frac{5}{17} = \frac{5 \times 17}{2 \times 5} \times \frac{5}{17} = \frac{17}{2} \times \frac{5}{17} = \frac{5}{2} = 2,5 \)
- в) \( 5 \frac{2}{3} \times 9 = \frac{5 \times 3 + 2}{3} \times 9 = \frac{17}{3} \times 9 = 17 \times 3 = 51 \)
Ответ: а) \( \frac{1}{24} \); б) \( 2,5 \); в) \( 51 \).