4. Выполните сложение (вычитание) дробей с раз- ными знаменателями:
[tex] \frac{8}{15} + \frac{7}{12} = \\ \frac{21}{50} - \frac{7}{30} = \\ \frac{5}{42} + \frac{5}{36} = \\ \frac{11}{24} + \frac{4}{15} = \\ \frac{11}{30} - \frac{7}{80} = \\ \frac{19}{35} + \frac{10}{21} [/tex]
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