Выполните действие:
а) $\frac{5}{6} + \frac{1}{4}$;
б) $\frac{7}{8} - \frac{5}{6}$;
в) $\frac{3}{10} - \frac{4}{15}$;
г) $5 - 3\frac{2}{7}$;
д) $\frac{4}{9} * \frac{3}{8}$;
ж) $\frac{5}{8} : \frac{9}{10}$;
з) $2\frac{6}{7} : 1\frac{3}{7}$;
е) $6\frac{3}{5} * 10$.
$\frac{5}{6} + \frac{1}{4} = \frac{20}{24} + \frac{6}{24} = \frac{26}{24} = \frac{13}{12} = 1\frac{1}{12}$
$\frac{7}{8} - \frac{5}{6} = \frac{21}{24} - \frac{20}{24} = \frac{1}{24}$
$\frac{3}{10} - \frac{4}{15} = \frac{9}{30} - \frac{8}{30} = \frac{1}{30}$
$5 - 3\frac{2}{7} = 4\frac{7}{7} - 3\frac{2}{7} = 1\frac{5}{7}$
$\frac{4}{9} * \frac{3}{8} = \frac{1}{3} * \frac{1}{2} = \frac{1}{6}$
$\frac{5}{8} : \frac{9}{10} = \frac{5}{8} * \frac{10}{9} = \frac{5}{4} * \frac{5}{9} = \frac{25}{36}$
$2\frac{6}{7} : 1\frac{3}{7} = \frac{20}{7} : \frac{10}{7} = \frac{20}{7} * \frac{7}{10} = \frac{2}{1} * \frac{1}{1} = 2$
$6\frac{3}{5} * 10 = \frac{33}{5} * 10 = \frac{33}{1} * 2 = 66$
Пожауйста, оцените решение