Вычислите:
а) $(\frac{3}{4} - \frac{1}{2}) * 5$;
б) $(\frac{5}{7} + \frac{1}{21}) : 2$;
в) $(\frac{7}{10} - \frac{1}{5}) : 3$;
г) $(\frac{1}{4} - \frac{1}{12}) * 5$;
д) $(\frac{1}{4} + \frac{1}{6}) : 10$;
е) $(\frac{5}{6} - \frac{1}{4}) : 7$.
$(\frac{3}{4} - \frac{1}{2}) * 5 = \frac{3 - 2}{4} * 5 = \frac{1}{4} * 5 = \frac{5}{4} = 1\frac{1}{4}$
$(\frac{5}{7} + \frac{1}{21}) : 2 = \frac{15 + 1}{21} : 2 = \frac{16}{21} : 2 = \frac{8}{21}$
$(\frac{7}{10} - \frac{1}{5}) : 3 = \frac{7 - 2}{10} : 3 = \frac{5}{10} : 3 = \frac{1}{2} : 3 = \frac{1}{6}$
$(\frac{1}{4} - \frac{1}{12}) * 5 = \frac{3 - 1}{12} * 5 = \frac{2}{12} * 5 = \frac{1}{6} * 5 = \frac{5}{6}$
$(\frac{1}{4} + \frac{1}{6}) : 10 = \frac{3 + 2}{12} : 10 = \frac{5}{12} : 10 = \frac{5}{120} = \frac{1}{24}$
$(\frac{5}{6} - \frac{1}{4}) : 7 = \frac{10 - 3}{12} : 7 = \frac{7}{12} : 7 = \frac{1}{12}$
Пожауйста, оцените решение