[tex] \frac{5}{7} + \frac{1}{4} = \frac{20 + 7}{28} = \frac{27}{28} \\ [/tex]

[tex] \\ \\ [/tex]

[tex] \frac{7}{15} - \frac{3}{10} = \frac{14 - 9}{30} = \frac{5}{30} = \frac{1}{6} \\ [/tex]

[tex] \\ \\ [/tex]

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

[tex] \\ \\ [/tex]

[tex] \frac{7}{30} + \frac{9}{20} = \frac{14 + 27}{60} = \frac{41}{60} \\ [/tex]

[tex] \\ [/tex]

[tex] \\ [/tex]

[tex] \frac{11}{16} - \frac{5}{12} = \frac{33 - 20}{48} = \frac{13}{48} \\ [/tex]

[tex] \\ \\ [/tex]

[tex] \frac{5}{18} + \frac{4}{27} = \frac{15 + 8}{54} = \frac{23}{54} \\ [/tex]

[tex] \\ \\ [/tex]

[tex] \frac{19}{42} - \frac{3}{28} = \frac{38 - 9}{84} = \frac{27}{84} \\ [/tex]

[tex] \\ \\ [/tex]

[tex] \frac{8}{9} - \frac{5}{6} + \frac{1}{3} = \frac{16 - 15 + 6}{18} = \frac{7}{18} \\ [/tex]

[tex] \\ \\ [/tex]

[tex] \frac{9}{16} + \frac{5}{6} - \frac{7}{24} = \frac{27 + 40 - 14}{48} = \frac{53}{48} \\ [/tex]

Ответ:

Пошаговое объяснение: