1. Выполните действие: a) $$\frac{3}{7} \cdot \frac{5}{11}$$ b) $$3\frac{3}{5} \cdot 1\frac{1}{9}$$ д) $$\frac{5}{9} : \frac{10}{27}$$ б) $$\frac{6}{25} \cdot \frac{5}{18}$$ г) $$1\frac{3}{7} \cdot 14$$ e) $$\frac{12}{13} : 6$$

a) $$\frac{3}{7} \cdot \frac{5}{11} = \frac{3 \cdot 5}{7 \cdot 11} = \frac{15}{77}$$ б) $$\frac{6}{25} \cdot \frac{5}{18} = \frac{6 \cdot 5}{25 \cdot 18} = \frac{1 \cdot 1}{5 \cdot 3} = \frac{1}{15}$$ в) $$3\frac{3}{5} \cdot 1\frac{1}{9} = \frac{3 \cdot 5 + 3}{5} \cdot \frac{1 \cdot 9 + 1}{9} = \frac{18}{5} \cdot \frac{10}{9} = \frac{18 \cdot 10}{5 \cdot 9} = \frac{2 \cdot 2}{1 \cdot 1} = 4$$ г) $$1\frac{3}{7} \cdot 14 = \frac{1 \cdot 7 + 3}{7} \cdot 14 = \frac{10}{7} \cdot 14 = \frac{10 \cdot 14}{7} = 10 \cdot 2 = 20$$ д) $$\frac{5}{9} : \frac{10}{27} = \frac{5}{9} \cdot \frac{27}{10} = \frac{5 \cdot 27}{9 \cdot 10} = \frac{1 \cdot 3}{1 \cdot 2} = \frac{3}{2} = 1\frac{1}{2}$$ e) $$\frac{12}{13} : 6 = \frac{12}{13} \cdot \frac{1}{6} = \frac{12 \cdot 1}{13 \cdot 6} = \frac{2 \cdot 1}{13 \cdot 1} = \frac{2}{13}$$