Выполните действия:
а) $(\frac{5}{8} - \frac{2}{5}) + \frac{3}{20}$;
б) $\frac{1}{8} + (\frac{5}{9} - \frac{1}{4})$;
в) $\frac{5}{6} - (\frac{3}{10} + \frac{2}{5})$;
г) $(\frac{3}{4} + \frac{1}{8}) - \frac{5}{8}$.
$(\frac{5}{8} - \frac{2}{5}) + \frac{3}{20} = (\frac{25}{40} - \frac{16}{40}) + \frac{6}{40} = \frac{9}{40} + \frac{6}{40} = \frac{15}{40} = \frac{3}{8}3/8$
$\frac{1}{8} + (\frac{5}{9} - \frac{1}{4}) = \frac{1}{8} + (\frac{20}{36} - \frac{9}{36}) = \frac{1}{8} + \frac{11}{36} = \frac{9}{72} + \frac{22}{72} = \frac{31}{72}$
$\frac{5}{6} - (\frac{3}{10} + \frac{2}{5}) = \frac{5}{6} - (\frac{3}{10} + \frac{4}{10}) = \frac{5}{6} - \frac{7}{10} = \frac{25}{30} - \frac{21}{30} = \frac{4}{30} = \frac{2}{15}$
$(\frac{3}{4} + \frac{1}{8}) - \frac{5}{8} = (\frac{6}{8} + \frac{1}{8}) - \frac{5}{8} = \frac{7}{8} - \frac{5}{8} = \frac{1}{4}$
Пожауйста, оцените решение
