1. Выполните умножение: 1) 2) 18:3) 30.3: 4) 47 · 2 711 4 9 12

1) $$ \frac{1}{7} \cdot \frac{8}{11} = \frac{1 \cdot 8}{7 \cdot 11} = \frac{8}{77} $$

2) $$ 18 \cdot \frac{4}{9} = \frac{18 \cdot 4}{9} = \frac{72}{9} = 8 $$

3) $$ 3 \frac{5}{9} \cdot 3 = \frac{32}{9} \cdot 3 = \frac{32 \cdot 3}{9} = \frac{32 \cdot 1}{3} = \frac{32}{3} = 10 \frac{2}{3} $$

4) $$ 4 \frac{7}{12} \cdot 2 \frac{11}{12} = \frac{55}{12} \cdot \frac{35}{12} = \frac{55 \cdot 35}{12 \cdot 12} = \frac{1925}{144} = 13 \frac{53}{144} $$

Ответ: 1) $$\frac{8}{77}$$; 2) 8; 3) $$10 \frac{2}{3}$$; 4) $$13 \frac{53}{144}$$