Вариант II 1. Вычислите: a) $$2\frac{2}{3} \cdot 1\frac{1}{7}$$; б) $$3\frac{1}{8} \cdot 1.2$$; г) $$5\frac{5}{6} : 2\frac{2}{9}$$; д) $$3\frac{3}{5} : 9$$; е) $$7\frac{3}{5} : 1\frac{9}{10}$$

a) $$2\frac{2}{3} \cdot 1\frac{1}{7} = \frac{8}{3} \cdot \frac{8}{7} = \frac{8 \cdot 8}{3 \cdot 7} = \frac{64}{21} = 3\frac{1}{21}$$

б) $$3\frac{1}{8} \cdot 1.2 = \frac{25}{8} \cdot \frac{12}{10} = \frac{25 \cdot 12}{8 \cdot 10} = \frac{300}{80} = \frac{15}{4} = 3\frac{3}{4}$$

г) $$5\frac{5}{6} : 2\frac{2}{9} = \frac{35}{6} : \frac{20}{9} = \frac{35}{6} \cdot \frac{9}{20} = \frac{35 \cdot 9}{6 \cdot 20} = \frac{315}{120} = \frac{21}{8} = 2\frac{5}{8}$$

д) $$3\frac{3}{5} : 9 = \frac{18}{5} : 9 = \frac{18}{5} \cdot \frac{1}{9} = \frac{18 \cdot 1}{5 \cdot 9} = \frac{18}{45} = \frac{2}{5}$$

е) $$7\frac{3}{5} : 1\frac{9}{10} = \frac{38}{5} : \frac{19}{10} = \frac{38}{5} \cdot \frac{10}{19} = \frac{38 \cdot 10}{5 \cdot 19} = \frac{380}{95} = 4$$