1. Вычислите: a) \(\frac{7}{15} + \frac{4}{15}\) б) \(\frac{11}{16} - \frac{5}{16}\) в) \(\frac{5}{6} \cdot \frac{4}{9}\) г) \(\frac{8}{15} : \frac{4}{5}\)

1. Вычислите:

а) \(\frac{7}{15} + \frac{4}{15}\) = \(\frac{7+4}{15}\) = \(\frac{11}{15}\)

Ответ: \(\frac{11}{15}\)

б) \(\frac{11}{16} - \frac{5}{16}\) = \(\frac{11-5}{16}\) = \(\frac{6}{16}\) = \(\frac{3}{8}\)

Ответ: \(\frac{3}{8}\)

в) \(\frac{5}{6} \cdot \frac{4}{9}\) = \(\frac{5 \cdot 4}{6 \cdot 9}\) = \(\frac{20}{54}\) = \(\frac{10}{27}\)

Ответ: \(\frac{10}{27}\)

г) \(\frac{8}{15} : \frac{4}{5}\) = \(\frac{8}{15} \cdot \frac{5}{4}\) = \(\frac{8 \cdot 5}{15 \cdot 4}\) = \(\frac{40}{60}\) = \(\frac{2}{3}\)

Ответ: \(\frac{2}{3}\)