Выполните дейтвия: а) 4 5/7+3 6/7; б) 7 1/13-5 5/13; в) 18 12/17+5 15/17; г) 24 5/9-21 7/9
Тема: Сложение и вычитание смешанных чисел.
20 баллов
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