Пошаговое объяснение:

[tex] \frac{2}{9} + \frac{1}{2} = \frac{4}{18} + \frac{9}{18} = \frac{13}{18} [/tex]

[tex]\frac{7}{50} + \frac{7}{30} = \frac{21}{150} + \frac{35}{150} = \frac{56}{150} = \frac{28}{75}[/tex]

[tex] \frac{1}{2} + \frac{3}{5} + \frac{7}{10} = \frac{5}{10} + \frac{6}{10} + \frac{7}{10} = \frac{18}{10} = 1 \frac{8}{10} [/tex]

[tex] \frac{7}{50} + \frac{7}{30} = \frac{21}{150} + \frac{35}{150} = \frac{28}{150} [/tex]

[tex] \frac{1}{20} + \frac{3}{24} = \frac{6}{120} + \frac{15}{120} = \frac{21}{120} = \frac{7}{40} [/tex]

[tex] \frac{4}{9} + \frac{1}{6} = \frac{8}{18} + \frac{3}{18} = \frac{11}{18}[/tex]