Найдите значение выражения:
а) $\frac{14}{15} * \frac{10}{49} + 5\frac{3}{7}$;
б) $1\frac{3}{11} - \frac{27}{44} * \frac{4}{9}$;
в) $1\frac{2}{3} + \frac{14}{15} * \frac{5}{7}$.
$\frac{14}{15} * \frac{10}{49} + 5\frac{3}{7} = \frac{2}{3} * \frac{2}{7} + 5\frac{3}{7} = \frac{4}{21} + 5\frac{9}{21} = 5\frac{13}{21}$
$1\frac{3}{11} - \frac{27}{44} * \frac{4}{9} = 1\frac{3}{11} - \frac{3}{11} * \frac{1}{1} = 1\frac{3}{11} - \frac{3}{11} = 1$
$1\frac{2}{3} + \frac{14}{15} * \frac{5}{7} = 1\frac{2}{3} + \frac{2}{3} * \frac{1}{1} = 1\frac{2}{3} + \frac{2}{3} = 1\frac{4}{3} = 2\frac{1}{3}$