Вычислите:
а) $\frac{1}{3} * \frac{2}{7}$;
б) $\frac{1}{2} * \frac{5}{6}$;
в) $\frac{3}{4} * \frac{1}{4}$;
г) $\frac{2}{5} * \frac{7}{5}$;
д) $\frac{1}{2} * \frac{1}{3}$.
$\frac{1}{3} * \frac{2}{7} = \frac{1 * 2}{3 * 7} = \frac{2}{21}$
$\frac{1}{2} * \frac{5}{6} = \frac{1 * 5}{2 * 6} = \frac{5}{12}$
$\frac{3}{4} * \frac{1}{4} = \frac{3 * 1}{4 * 4} = \frac{3}{16}$
$\frac{2}{5} * \frac{7}{5} = \frac{2 * 7}{5 * 5} = \frac{14}{25}$
$\frac{1}{2} * \frac{1}{3} = \frac{1 * 2}{1 * 3} = \frac{1}{6}$