Вычислите:
а) $\frac{1}{2} + \frac{2}{5}$;
б) $\frac{1}{2} - \frac{2}{5}$;
в) $\frac{1}{4} + \frac{1}{6}$;
г) $\frac{9}{10} - \frac{5}{6}$.
$\frac{1}{2} + \frac{2}{5} = \frac{1^{(5}}{2} + \frac{2^{(2}}{5} = \frac{5 + 4}{10} = \frac{9}{10}$
$\frac{1}{2} - \frac{2}{5} = \frac{1^{(5}}{2} - \frac{2^{(2}}{5} = \frac{5 - 4}{10} = \frac{1}{10}$
$\frac{1}{4} + \frac{1}{6} = \frac{1^{(3}}{4} + \frac{1^{(2}}{6} = \frac{3 + 2}{12} = \frac{5}{12}$
$\frac{9}{10} - \frac{5}{6} = \frac{9^{(3}}{10} - \frac{5^{(5}}{6} = \frac{27 - 25}{30} = \frac{2}{30} = \frac{1}{15}$
Пожауйста, оцените решение
