Вычислите сумму:
а) $\frac{11}{30} + \frac{7}{12}$;
б) $\frac{1}{27} + \frac{5}{18}$;
в) $\frac{1}{6} + \frac{1}{10} + \frac{1}{15}$;
г) $\frac{3}{7} + \frac{1}{6} + \frac{5}{14}$;
д) $\frac{5}{12} + \frac{2}{9} + \frac{1}{18}$;
е) $\frac{1}{2} + \frac{1}{3} + \frac{1}{9}$.
$\frac{11}{30} + \frac{7}{12} = \frac{22 + 35}{60} = \frac{57}{60} = \frac{19}{20}$
$\frac{1}{27} + \frac{5}{18} = \frac{2 + 15}{54} = \frac{17}{54}$
$\frac{1}{6} + \frac{1}{10} + \frac{1}{15} = \frac{5 + 3 + 2}{30} = \frac{10}{30} = \frac{1}{3}$
$\frac{3}{7} + \frac{1}{6} + \frac{5}{14} = \frac{18 + 7 + 15}{42} = \frac{40}{42} = \frac{20}{21}$
$\frac{5}{12} + \frac{2}{9} + \frac{1}{18} = \frac{15 + 8 + 2}{36} = \frac{25}{36}$
$\frac{1}{2} + \frac{1}{3} + \frac{1}{9} = \frac{9 + 6 + 2}{18} = \frac{17}{18}$
Пожауйста, оцените решение