1. Выполните умножение:

1) $$rac{5}{6} \cdot \frac{3}{20} = \frac{5 \cdot 3}{6 \cdot 20} = \frac{15}{120} = \frac{1}{8}$$ 2) $$rac{3}{7} \cdot \frac{6}{11} = \frac{3 \cdot 6}{7 \cdot 11} = \frac{18}{77}$$ 3) $$rac{10}{11} \cdot \frac{11}{26} = \frac{10 \cdot 11}{11 \cdot 26} = \frac{10}{26} = \frac{5}{13}$$ 4) $$rac{24}{65} \cdot \frac{39}{40} = \frac{24 \cdot 39}{65 \cdot 40} = \frac{6 \cdot 3}{5 \cdot 10} = \frac{18}{50} = \frac{9}{25}$$