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Решение примеров на умножение дробей: 1) $\frac{1}{2} \cdot \frac{5}{6} = \frac{1 \cdot 5}{2 \cdot 6} = \frac{5}{12}$ 2) $\frac{4}{5} \cdot \frac{5}{7} = \frac{4 \cdot 5}{5 \cdot 7} = \frac{4}{7}$ 3) $4 \cdot \frac{5}{9} = \frac{4}{1} \cdot \frac{5}{9} = \frac{4 \cdot 5}{1 \cdot 9} = \frac{20}{9} = 2\frac{2}{9}$ 4) $1\frac{1}{2} \cdot \frac{2}{3} = \frac{3}{2} \cdot \frac{2}{3} = \frac{3 \cdot 2}{2 \cdot 3} = 1$ 5) $1\frac{1}{3} \cdot 2\frac{1}{4} = \frac{4}{3} \cdot \frac{9}{4} = \frac{4 \cdot 9}{3 \cdot 4} = 3$ 6) $\frac{8}{9} \cdot \frac{1}{3} = \frac{8 \cdot 1}{9 \cdot 3} = \frac{8}{27}$ 7) $\frac{8}{9} \cdot \frac{3}{5} = \frac{8 \cdot 3}{9 \cdot 5} = \frac{8}{3 \cdot 5} = \frac{8}{15}$ 8) $\frac{5}{13} \cdot 3 = \frac{5}{13} \cdot \frac{3}{1} = \frac{5 \cdot 3}{13 \cdot 1} = \frac{15}{13} = 1\frac{2}{13}$ 9) $2\frac{1}{2} \cdot \frac{2}{5} = \frac{5}{2} \cdot \frac{2}{5} = \frac{5 \cdot 2}{2 \cdot 5} = 1$ 10) $3\frac{1}{3} \cdot 1\frac{1}{2} = \frac{10}{3} \cdot \frac{3}{2} = \frac{10 \cdot 3}{3 \cdot 2} = \frac{10}{2} = 5$ 11) $\frac{4}{9} \cdot \frac{2}{3} = \frac{4 \cdot 2}{9 \cdot 3} = \frac{8}{27}$ 12) $\frac{7}{8} \cdot 1\frac{1}{7} = \frac{7}{8} \cdot \frac{8}{7} = \frac{7 \cdot 8}{8 \cdot 7} = 1$ 13) $\frac{7}{9} \cdot 2 = \frac{7}{9} \cdot \frac{2}{1} = \frac{14}{9} = 1\frac{5}{9}$ 14) $\frac{7}{8} \cdot 5\frac{1}{3} = \frac{7}{8} \cdot \frac{16}{3} = \frac{7 \cdot 16}{8 \cdot 3} = \frac{7 \cdot 2}{3} = \frac{14}{3} = 4\frac{2}{3}$ 15) $2\frac{3}{4} \cdot 1\frac{1}{11} = \frac{11}{4} \cdot \frac{12}{11} = \frac{11 \cdot 12}{4 \cdot 11} = \frac{12}{4} = 3$