Вычислите:
а) $12 * \frac{1}{6} * 1\frac{1}{2} * 3\frac{3}{4} * 4\frac{1}{5}$;
б) $3 * 5\frac{1}{4} * 1\frac{1}{7} * 5\frac{1}{2} * \frac{4}{11}$.
$12 * \frac{1}{6} * 1\frac{1}{2} * 3\frac{3}{4} * 4\frac{1}{5} = \frac{12}{1} * \frac{1}{6} * \frac{3}{2} * \frac{15}{4} * \frac{21}{5} = \frac{12 * 1 * 3 * 15 * 21}{1 * 6 * 2 * 4 * 5} = \frac{1 * 1 * 3 * 3 * 21}{1 * 1 * 1 * 4 * 1} = \frac{189}{4} = 47\frac{1}{4}$
$3 * 5\frac{1}{4} * 1\frac{1}{7} * 5\frac{1}{2} * \frac{4}{11} = \frac{3}{1} * \frac{21}{4} * \frac{8}{7} * \frac{11}{2} * \frac{4}{11} = \frac{3 * 21 * 8 * 11 * 4}{1 * 4 * 7 * 2 * 11} = \frac{3 * 3 * 4 * 1 * 1}{1 * 1 * 1 * 1 * 1} = 36$