2. Тип 2.1 № 1935 Вычислите: $$\frac{5}{6} - \frac{4}{9} : \frac{16}{21}$$

Решение: 1. $$\frac{4}{9} : \frac{16}{21} = \frac{4}{9} \cdot \frac{21}{16} = \frac{4 \cdot 21}{9 \cdot 16} = \frac{1 \cdot 7}{3 \cdot 4} = \frac{7}{12}$$ 2. $$\frac{5}{6} - \frac{7}{12} = \frac{5 \cdot 2}{6 \cdot 2} - \frac{7}{12} = \frac{10}{12} - \frac{7}{12} = \frac{10-7}{12} = \frac{3}{12} = \frac{1}{4}$$ Ответ: **$$\frac{1}{4}$$**