17. Выполните умножение

Привет! Давай решим примеры с дробями по порядку. 1) $\frac{5}{12} \cdot 4 = \frac{5 \cdot 4}{12} = \frac{5}{3} = 1\frac{2}{3}$ 2) $\frac{3}{7} \cdot 49 = 3 \cdot 7 = 21$ 3) $\frac{5}{8} : 25 = \frac{5}{8} \cdot \frac{1}{25} = \frac{1}{8 \cdot 5} = \frac{1}{40}$ 4) $\frac{3}{14} : 9 = \frac{3}{14} \cdot \frac{1}{9} = \frac{1}{14 \cdot 3} = \frac{1}{42}$ 5) $5 : \frac{15}{19} = 5 \cdot \frac{19}{15} = \frac{19}{3} = 6\frac{1}{3}$ 6) $4 : \frac{16}{25} = 4 \cdot \frac{25}{16} = \frac{25}{4} = 6\frac{1}{4}$ 7) $\frac{5}{11} : 5 = \frac{5}{11} \cdot \frac{1}{5} = \frac{1}{11}$ 8) $\frac{12}{35} : 6 = \frac{12}{35} \cdot \frac{1}{6} = \frac{2}{35}$ 9) $10 : 3\frac{1}{3} = 10 : \frac{10}{3} = 10 \cdot \frac{3}{10} = 3$ 10) $3\frac{1}{6} : \frac{19}{24} = \frac{19}{6} : \frac{19}{24} = \frac{19}{6} \cdot \frac{24}{19} = 4$ 11) $3\frac{3}{7} \cdot 1\frac{1}{6} = \frac{24}{7} \cdot \frac{7}{6} = \frac{4}{1} = 4$ 12) $2\frac{4}{7} : \frac{9}{14} = \frac{18}{7} : \frac{9}{14} = \frac{18}{7} \cdot \frac{14}{9} = 2 \cdot 2 = 4$ 13) $\frac{5}{49} \cdot 4\frac{1}{12} = \frac{5}{49} \cdot \frac{49}{12} = \frac{5}{12}$