https://uchimdeti.wordpress.com/2021/07/25/%d0%b7%d0%b0%d0%bd%d1%8f%d1%82%d0%b8%d0%b5-%e2%84%9639-%d0%bc%d0%b0%d1%82%d0%b5%d0%bc%d0%b0%d1%82%d0%b8%d0%ba%d0%b0-%d1%87%d0%b8%d1%81%d0%bb%d0%be-10-%d1%81%d1%82%d1%80-52-53/
Занятие №39: Математика. Число 10, стр. 52-53