Найдите произведение или частное:
а) $\frac{9}{10} * \frac{5}{12}$;
б) $\frac{3}{5} : \frac{11}{15}$;
в) $\frac{9}{22} * \frac{2}{3}$;
г) $\frac{7}{8} : \frac{7}{16}$;
д) $\frac{27}{40} : \frac{18}{35}$;
е) $\frac{8}{9} : 6$;
ж) $15 * \frac{5}{6}$;
з) $1 : \frac{3}{7}$;
и) $\frac{2}{3} * 12$;
к) $\frac{2}{3} : 18$;
л) $\frac{8}{27} * 36$;
м) $10 : \frac{4}{15}$.
$\frac{9}{10} * \frac{5}{12} = \frac{9 * 5}{10 * 12} = \frac{3 * 1}{2 * 4} = \frac{3}{8}$
$\frac{3}{5} : \frac{11}{15} = \frac{3}{5} * \frac{15}{11} = \frac{3 * 15}{5 * 11} = \frac{3 * 3}{1 * 11} = \frac{9}{11}$
$\frac{9}{22} * \frac{2}{3} = \frac{9 * 2}{22 * 3} = \frac{3 * 1}{11 * 1} = \frac{3}{11}$
$\frac{7}{8} : \frac{7}{16} = \frac{7}{8} * \frac{16}{7} = \frac{7 * 16}{8 * 7} = \frac{1 * 2}{1 * 1} = 2$
$\frac{27}{40} : \frac{18}{35} = \frac{27}{40} * \frac{35}{18} = \frac{27 * 35}{40 * 18} = \frac{3 * 7}{8 * 2} = \frac{21}{16} = 1\frac{5}{16}$
$\frac{8}{9} : 6 = \frac{8}{9} * \frac{1}{6} = \frac{8 * 1}{9 * 6} = \frac{4 * 1}{9 * 3} = \frac{4}{27}$
$15 * \frac{5}{6} = \frac{15 * 5}{6} = \frac{5 * 5}{2} = \frac{25}{2} = 12\frac{1}{2}$
$1 : \frac{3}{7} = 1 * \frac{7}{3} = \frac{7}{3} = 2\frac{1}{3}$
$\frac{2}{3} * 12 = \frac{2 * 12}{3} = \frac{2 * 4}{1} = \frac{8}{1} = 8$
$\frac{2}{3} : 18 = \frac{2}{3} * \frac{1}{18} = \frac{2 * 1}{3 * 18} = \frac{1 * 1}{3 * 9} = \frac{1}{27}$
$\frac{8}{27} * 36 = \frac{8 * 36}{27} = \frac{8 * 4}{3} = \frac{32}{3} = 10\frac{2}{3}$
$10 : \frac{4}{15} = 10 * \frac{15}{4} = \frac{10 * 15}{4} = \frac{5 * 15}{2} = \frac{75}{2} = 37\frac{1}{2}$
Пожауйста, оцените решение