Задание 1. Найдите значение в

1) $\frac{3}{4} \cdot \frac{6}{5} = \frac{3 \cdot 6}{4 \cdot 5} = \frac{18}{20} = \frac{9}{10} = 0,9$ 2) $\frac{21}{5} \cdot \frac{3}{7} = \frac{21 \cdot 3}{5 \cdot 7} = \frac{3 \cdot 3}{5 \cdot 1} = \frac{9}{5} = 1,8$ 3) $\frac{3}{5} \cdot \frac{25}{4} = \frac{3 \cdot 25}{5 \cdot 4} = \frac{3 \cdot 5}{1 \cdot 4} = \frac{15}{4} = 3,75$ 4) $\frac{9}{5} \cdot \frac{2}{3} = \frac{9 \cdot 2}{5 \cdot 3} = \frac{3 \cdot 2}{5 \cdot 1} = \frac{6}{5} = 1,2$ 5) $\frac{5}{3} \cdot \frac{9}{2} = \frac{5 \cdot 9}{3 \cdot 2} = \frac{5 \cdot 3}{1 \cdot 2} = \frac{15}{2} = 7,5$ 6) $\frac{7}{5} \cdot \frac{12}{35} = \frac{7 \cdot 12}{5 \cdot 35} = \frac{1 \cdot 12}{5 \cdot 5} = \frac{12}{25} = 0,48$ 7) $\frac{12}{5} : \frac{15}{2} = \frac{12}{5} \cdot \frac{2}{15} = \frac{4 \cdot 2}{5 \cdot 5} = \frac{8}{25} = 0,32$ 8) $\frac{6}{5} : \frac{4}{11} = \frac{6}{5} \cdot \frac{11}{4} = \frac{3 \cdot 11}{5 \cdot 2} = \frac{33}{10} = 3,3$ 9) $\frac{3}{5} : \frac{4}{35} = \frac{3}{5} \cdot \frac{35}{4} = \frac{3 \cdot 7}{1 \cdot 4} = \frac{21}{4} = 5,25$ 10) $\frac{15}{4} : \frac{3}{7} = \frac{15}{4} \cdot \frac{7}{3} = \frac{5 \cdot 7}{4 \cdot 1} = \frac{35}{4} = 8,75$ 11) $\frac{21}{2} : \frac{3}{5} = \frac{21}{2} \cdot \frac{5}{3} = \frac{7 \cdot 5}{2 \cdot 1} = \frac{35}{2} = 17,5$ 12) $\frac{14}{5} : \frac{7}{2} = \frac{14}{5} \cdot \frac{2}{7} = \frac{2 \cdot 2}{5 \cdot 1} = \frac{4}{5} = 0,8$