5.445 Вычислите: a) \(\frac{1}{2} + \frac{1}{3}\); б) \(\frac{1}{3} + \frac{2}{7}\); в) \(\frac{3}{7} + \frac{4}{9}\); г) \(\frac{5}{9} - \frac{1}{6}\); д) \(\frac{9}{5} - \frac{7}{10}\); e) \(\frac{1}{6} + \frac{1}{3}\); ж) \(\frac{7}{15} - \frac{3}{10}\); з) \(\frac{5}{11} + \frac{3}{5}\); и) \(\frac{3}{8} + \frac{5}{12}\); к) \(\frac{17}{30} - \(\frac{3}{6}\); л) \(\frac{5}{6} - \frac{1}{2}\); m) \(\frac{17}{35} - \frac{4}{15}\).

a) \(\frac{1}{2} + \frac{1}{3} = \frac{3}{6} + \frac{2}{6} = \frac{5}{6}\)

б) \(\frac{1}{3} + \frac{2}{7} = \frac{7}{21} + \frac{6}{21} = \frac{13}{21}\)

в) \(\frac{3}{7} + \frac{4}{9} = \frac{27}{63} + \frac{28}{63} = \frac{55}{63}\)

г) \(\frac{5}{9} - \frac{1}{6} = \frac{10}{18} - \frac{3}{18} = \frac{7}{18}\)

д) \(\frac{9}{5} - \frac{7}{10} = \frac{18}{10} - \frac{7}{10} = \frac{11}{10}\)

e) \(\frac{1}{6} + \frac{1}{3} = \frac{1}{6} + \frac{2}{6} = \frac{3}{6} = \frac{1}{2}\)

ж) \(\frac{7}{15} - \frac{3}{10} = \frac{14}{30} - \frac{9}{30} = \frac{5}{30} = \frac{1}{6}\)

з) \(\frac{5}{11} + \frac{3}{5} = \frac{25}{55} + \frac{33}{55} = \frac{58}{55}\)

и) \(\frac{3}{8} + \frac{5}{12} = \frac{9}{24} + \frac{10}{24} = \frac{19}{24}\)

к) \(\frac{17}{30} - \frac{3}{6} = \frac{17}{30} - \frac{15}{30} = \frac{2}{30} = \frac{1}{15}\)

л) \(\frac{5}{6} - \frac{1}{2} = \frac{5}{6} - \frac{3}{6} = \frac{2}{6} = \frac{1}{3}\)

м) \(\frac{17}{35} - \frac{4}{15} = \frac{51}{105} - \frac{28}{105} = \frac{23}{105}\)