а) $\frac{9}{10} * \frac{5}{12}$;
б) $\frac{3}{5} : \frac{11}{5}$;
в) $\frac{21}{22} * \frac{2}{5}$;
г) $\frac{7}{8} : \frac{7}{16}$;
д) $1\frac{3}{5} * 2\frac{1}{2}$;
е) $1\frac{3}{4} : 10\frac{1}{2}$.
$\frac{9}{10} * \frac{5}{12} = \frac{3}{2} * \frac{1}{4} = \frac{3}{8}$
$\frac{3}{5} : \frac{11}{5} = \frac{3}{5} * \frac{5}{11} = \frac{3}{1} * \frac{1}{11} = \frac{3}{11}$
$\frac{21}{22} * \frac{2}{5} = \frac{21}{11} * \frac{1}{5} = \frac{21}{55}$
$\frac{7}{8} : \frac{7}{16} = \frac{7}{8} * \frac{16}{7} = \frac{1}{1} * \frac{2}{1} = 2$
$1\frac{3}{5} * 2\frac{1}{2} = \frac{8}{5} * \frac{5}{2} = \frac{4}{1} * \frac{1}{1} = 4$
$1\frac{3}{4} : 10\frac{1}{2} = \frac{7}{4} : \frac{21}{2} = \frac{7}{4} * \frac{2}{21} = \frac{1}{2} * \frac{1}{3} = \frac{1}{6}$
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