46. \(\frac{2}{3} : \frac{6}{7}\)

Решение:

\(\frac{2}{3} \div \frac{6}{7} = \frac{2}{3} \times \frac{7}{6} = \frac{2 \times 7}{3 \times 6} = \frac{14}{18} = \frac{7}{9}\)

Ответ: \(\frac{7}{9}\)