1. Выполните деление: 1) $$3\frac{1}{3}:5$$; 2) $$20:1\frac{3}{7}$$; 3) $$2\frac{2}{9}:1\frac{7}{9}$$.

1) $$3\frac{1}{3}:5 = \frac{10}{3}:5 = \frac{10}{3} \cdot \frac{1}{5} = \frac{10}{15} = \frac{2}{3}$$

2) $$20:1\frac{3}{7} = 20:\frac{10}{7} = 20 \cdot \frac{7}{10} = \frac{20 \cdot 7}{10} = \frac{140}{10} = 14$$

3) $$2\frac{2}{9}:1\frac{7}{9} = \frac{20}{9}:\frac{16}{9} = \frac{20}{9} \cdot \frac{9}{16} = \frac{20}{16} = \frac{5}{4} = 1\frac{1}{4}$$

Ответ: 1) $$\frac{2}{3}$$; 2) 14; 3) $$1\frac{1}{4}$$