Найди значение выражения: 1) 12:3 3/8 - 1 1/4 : 15/32

Конечно, давай решим эти примеры по порядку! 1) $12 : 3\frac{3}{8} - 1\frac{1}{4} : \frac{15}{32} = 12 : \frac{27}{8} - \frac{5}{4} : \frac{15}{32} = 12 * \frac{8}{27} - \frac{5}{4} * \frac{32}{15} = \frac{32}{9} - \frac{8}{3} = \frac{32}{9} - \frac{24}{9} = \frac{8}{9}$ 2) $1\frac{31}{35} : (2 - \frac{8}{9} : 1\frac{19}{45}) = \frac{66}{35} : (2 - \frac{8}{9} : \frac{64}{45}) = \frac{66}{35} : (2 - \frac{8}{9} * \frac{45}{64}) = \frac{66}{35} : (2 - \frac{5}{8}) = \frac{66}{35} : \frac{11}{8} = \frac{66}{35} * \frac{8}{11} = \frac{48}{35} = 1\frac{13}{35}$ 3) $(1\frac{1}{35} : \frac{4}{5} - 1\frac{8}{35}) * 3\frac{1}{3} = (\frac{36}{35} : \frac{4}{5} - \frac{43}{35}) * \frac{10}{3} = (\frac{36}{35} * \frac{5}{4} - \frac{43}{35}) * \frac{10}{3} = (\frac{9}{7} - \frac{43}{35}) * \frac{10}{3} = (\frac{45}{35} - \frac{43}{35}) * \frac{10}{3} = \frac{2}{35} * \frac{10}{3} = \frac{4}{21}$ 4) $(7 - 1\frac{5}{9} : \frac{7}{24}) : \frac{20}{27} = (7 - \frac{14}{9} : \frac{7}{24}) : \frac{20}{27} = (7 - \frac{14}{9} * \frac{24}{7}) : \frac{20}{27} = (7 - \frac{16}{3}) : \frac{20}{27} = (\frac{21}{3} - \frac{16}{3}) : \frac{20}{27} = \frac{5}{3} : \frac{20}{27} = \frac{5}{3} * \frac{27}{20} = \frac{9}{4} = 2\frac{1}{4}$