Реши примеры из второго варианта

1. $2 \frac{1}{3} \cdot 1 \frac{4}{7} = \frac{7}{3} \cdot \frac{11}{7} = \frac{77}{21} = \frac{11}{3} = 3 \frac{2}{3}$ 2. $\frac{11}{12} : \frac{22}{36} = \frac{11}{12} \cdot \frac{36}{22} = \frac{1}{1} \cdot \frac{3}{2} = 1 \frac{1}{2}$ 3. $\frac{4}{15} \cdot \frac{9}{16} = \frac{1}{5} \cdot \frac{3}{4} = \frac{3}{20}$ 4. $3 \frac{1}{5} : 1 \frac{3}{5} = \frac{16}{5} : \frac{8}{5} = \frac{16}{5} \cdot \frac{5}{8} = \frac{2}{1} \cdot \frac{1}{1} = 2$ 5. $1 \frac{5}{6} : 2 \frac{1}{4} = \frac{11}{6} : \frac{9}{4} = \frac{11}{6} \cdot \frac{4}{9} = \frac{11}{3} \cdot \frac{2}{9} = \frac{22}{27}$ 6. $\frac{7}{8} \cdot \frac{12}{21} = \frac{1}{2} \cdot \frac{3}{3} = \frac{1}{2}$ 7. $2 \frac{2}{9} \cdot 1 \frac{1}{2} = \frac{20}{9} \cdot \frac{3}{2} = \frac{10}{3} \cdot \frac{1}{1} = \frac{10}{3} = 3 \frac{1}{3}$ 8. $\frac{5}{18} : \frac{10}{27} = \frac{5}{18} \cdot \frac{27}{10} = \frac{1}{2} \cdot \frac{3}{2} = \frac{3}{4}$ 9. $4 \frac{2}{7} : 1 \frac{5}{14} = \frac{30}{7} : \frac{19}{14} = \frac{30}{7} \cdot \frac{14}{19} = \frac{30}{1} \cdot \frac{2}{19} = \frac{60}{19} = 3 \frac{3}{19}$ 10. $\frac{13}{20} \cdot \frac{25}{39} = \frac{1}{4} \cdot \frac{5}{3} = \frac{5}{12}$