Решение:
$$\frac{9}{14} \cdot (\frac{17}{24} - \frac{5}{12}) = \frac{9}{14} \cdot (\frac{17}{24} - \frac{10}{24}) = \frac{9}{14} \cdot \frac{7}{24} = \frac{9 \cdot 7}{14 \cdot 24} = \frac{9 \cdot 1}{2 \cdot 24} = \frac{9}{48} = \frac{3}{16}$$
Ответ: $$\frac{3}{16}$$