Ментальная арифметика.Методика обучения и развития детей.
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![💼 НЕ Ментальная Арифметика | 5 приемов быстрого счета в уме [Школа Скорочтения и развития памяти]](https://sun9-6.userapi.com/l0beRAyOKNKeaurGyFJ47kPQkTWr2kHWO3dv_g/nfhMaNgt6RA.jpg)
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