Сложение\вычитание обычных дробей
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![Рисование двумя руками | Развитие интеллекта Вашего ребенка [Школа скорочтения и развития памяти]](https://sun9-22.userapi.com/9TpMsm2FTh_gSvchdtNE5nNz0rh9g4cDBONarg/rdzq9RKIQM4.jpg)
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