Вычислите:
а) $\frac{11}{30} + \frac{7}{12}$;
б) $\frac{1}{27} + \frac{5}{18}$;
в) $\frac{5}{21} - \frac{5}{28}$;
г) $\frac{11}{18} - \frac{7}{12}$.
$\frac{11}{30} + \frac{7}{12} = \frac{22}{60} + \frac{35}{60} = \frac{57}{60} = \frac{19}{20}$
$\frac{1}{27} + \frac{5}{18} = \frac{2}{54} + \frac{15}{54} = \frac{17}{54}$
$\frac{5}{21} - \frac{5}{28} = \frac{20}{84} - \frac{15}{84} = \frac{5}{84}$
$\frac{11}{18} - \frac{7}{12} = \frac{22}{36} - \frac{21}{36} = \frac{1}{36}$
Пожауйста, оцените решение
