1. Вычислите: a) 2; 10 б) 5.2; B) 1.1; 10 г): 2; д) 90:6; e) 2:10.

a) $$\frac{3}{10} \cdot 2\frac{2}{9} = \frac{3}{10} \cdot \frac{20}{9} = \frac{3 \cdot 20}{10 \cdot 9} = \frac{60}{90} = \frac{2}{3}$$

б) $$5\frac{1}{7} \cdot 2 = \frac{36}{7} \cdot 2 = \frac{36 \cdot 2}{7} = \frac{72}{7} = 10\frac{2}{7}$$

в) $$1\frac{1}{9} \cdot 1\frac{4}{5} = \frac{10}{9} \cdot \frac{9}{5} = \frac{10 \cdot 9}{9 \cdot 5} = \frac{90}{45} = 2$$

г) $$\frac{8}{7}:2\frac{2}{7} = \frac{8}{7} : \frac{16}{7} = \frac{8}{7} \cdot \frac{7}{16} = \frac{8 \cdot 7}{7 \cdot 16} = \frac{56}{112} = \frac{1}{2}$$

д) $$9\frac{3}{5} : 6 = \frac{48}{5} : 6 = \frac{48}{5} \cdot \frac{1}{6} = \frac{48 \cdot 1}{5 \cdot 6} = \frac{48}{30} = \frac{8}{5} = 1\frac{3}{5}$$

e) $$2\frac{2}{3} : 1\frac{7}{9} = \frac{8}{3} : \frac{16}{9} = \frac{8}{3} \cdot \frac{9}{16} = \frac{8 \cdot 9}{3 \cdot 16} = \frac{72}{48} = \frac{3}{2} = 1\frac{1}{2}$$

Ответ: а) $$\frac{2}{3}$$; б) $$10\frac{2}{7}$$; в) 2; г) $$\frac{1}{2}$$; д) $$1\frac{3}{5}$$; e) $$1\frac{1}{2}$$