63. \(\frac{2}{3} \times \frac{9}{16} - \frac{7}{24} \times \frac{2}{7}\)

Решение:

\(\frac{2}{3} \times \frac{9}{16} - \frac{7}{24} \times \frac{2}{7} = \frac{2 \times 9}{3 \times 16} - \frac{7 \times 2}{24 \times 7} = \frac{18}{48} - \frac{14}{168} = \frac{3}{8} - \frac{1}{12} = \frac{3 \times 3}{8 \times 3} - \frac{1 \times 2}{12 \times 2} = \frac{9}{24} - \frac{2}{24} = \frac{7}{24}\)

Ответ: \(\frac{7}{24}\)