27.12.2018
Введение
http://tlyak.dagestanschool.ru/file/download?id=878
https://yandex.ru/video/search?text=%D0%B8%D1%81%D0%BB%D0%B0%D0%BC%20%D0%B8%20%D1%82%D0%B5%D1%80%D1%80%D0%BE%D1%80%D0%B8%D0%B7%D0%BC%20%D0%BD%D0%B5%D1%81%D0%BE%D0%B2%D0%BC%D0%B5%D1%81%D1%82%D0%B8%D0%BC%D1%8B&path=wizard&noreask=1&filmId=7372638121081738446&reqid=1522260430034073-773779250856352607720860-vla1-1372-V