Выполни действия с дробями из карточек №3, №4, №5 и №6

Решаю примеры на сложение и вычитание дробей: Карточка №3 1) $\frac{4}{5} - \frac{3}{10} = \frac{8}{10} - \frac{3}{10} = \frac{5}{10} = \frac{1}{2}$ 2) $\frac{1}{2} - \frac{4}{25} = \frac{25}{50} - \frac{8}{50} = \frac{17}{50}$ 3) $\frac{13}{15} + \frac{1}{5} = \frac{13}{15} + \frac{3}{15} = \frac{16}{15} = 1 \frac{1}{15}$ 4) $\frac{7}{15} + \frac{4}{45} = \frac{21}{45} + \frac{4}{45} = \frac{25}{45} = \frac{5}{9}$ 5) $\frac{9}{10} - \frac{7}{15} + \frac{4}{45} = \frac{27}{30} - \frac{14}{30} + \frac{4}{45} = \frac{13}{30} + \frac{4}{45} = \frac{39}{90} + \frac{8}{90} = \frac{47}{90}$ Карточка №4 1) $\frac{4}{5} + \frac{3}{7} = \frac{28}{35} + \frac{15}{35} = \frac{43}{35} = 1 \frac{8}{35}$ 2) $\frac{5}{9} - \frac{7}{18} = \frac{10}{18} - \frac{7}{18} = \frac{3}{18} = \frac{1}{6}$ 3) $\frac{5}{21} + \frac{5}{28} = \frac{20}{84} + \frac{15}{84} = \frac{35}{84} = \frac{5}{12}$ 4) $\frac{15}{19} + \frac{27}{38} = \frac{30}{38} + \frac{27}{38} = \frac{57}{38} = 1 \frac{19}{38} = 1 \frac{1}{2}$ 5) $\frac{7}{18} - \frac{1}{5} + \frac{1}{9} = \frac{35}{90} - \frac{18}{90} + \frac{10}{90} = \frac{17}{90} + \frac{10}{90} = \frac{27}{90} = \frac{3}{10}$ Карточка №5 1) $\frac{9}{16} + \frac{19}{24} = \frac{27}{48} + \frac{38}{48} = \frac{65}{48} = 1 \frac{17}{48}$ 2) $\frac{13}{60} - \frac{7}{40} = \frac{26}{120} - \frac{21}{120} = \frac{5}{120} = \frac{1}{24}$ 3) $\frac{11}{42} - \frac{5}{28} = \frac{22}{84} - \frac{15}{84} = \frac{7}{84} = \frac{1}{12}$ 4) $\frac{9}{20} + \frac{5}{12} = \frac{27}{60} + \frac{25}{60} = \frac{52}{60} = \frac{13}{15}$ 5) $\frac{7}{15} - \frac{1}{6} - \frac{1}{10} = \frac{14}{30} - \frac{5}{30} - \frac{3}{30} = \frac{9}{30} - \frac{3}{30} = \frac{6}{30} = \frac{1}{5}$ Карточка №6 1) $\frac{2}{7} - \frac{5}{42} = \frac{12}{42} - \frac{5}{42} = \frac{7}{42} = \frac{1}{6}$ 2) $\frac{1}{11} + \frac{1}{33} = \frac{3}{33} + \frac{1}{33} = \frac{4}{33}$ 3) $\frac{5}{12} + \frac{5}{18} = \frac{15}{36} + \frac{10}{36} = \frac{25}{36}$ 4) $\frac{4}{35} + \frac{1}{28} = \frac{16}{140} + \frac{5}{140} = \frac{21}{140} = \frac{3}{20}$ 5) $\frac{19}{20} - \frac{3}{8} - \frac{1}{5} = \frac{38}{40} - \frac{15}{40} - \frac{8}{40} = \frac{23}{40} - \frac{8}{40} = \frac{15}{40} = \frac{3}{8}$