Математика. 3 класс. Тема: Письменные приемы сложения и вычитания трехзначных чисел. Абдувалиева С.
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![Как изобретают/открывают математику? [3Blue1Brown]](https://sun9-57.userapi.com/e9v-yGBHJvzTLKjDdf2aoV6rf8pFCM7iTX465g/yMSheaNfXdc.jpg)
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