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Video lessons are ideal assistants in studying new topics, consolidating material, for regular and optional classes, for group and individual work. They contain the optimal amount of graphic and animation information to focus attention and hold the interest of children without distracting from the essence of the lesson. Each video lesson is voiced by a professional male voice, clear and pleasant to perceive. Students appreciate the originality of the material presentation, parents are happy with the increase in their children's grades, and teachers are delighted with the effect and saving time and money when preparing for lessons. ★Infourok★ The largest online educational project in Russia WE OFFER: ✓ Additional education courses for children and adults: https://infourok.ru/ ✓ Tests for teachers and educators: https://infourok.ru/tests ✓ The most popular international distance Olympiads: https://infourok.ru/konkurs ✓ Video lessons on 14 subjects: https://infourok.ru/videouroki ✓ Tutor catalog: https://infourok.ru/tutor/ru ✓ Library of teaching materials for teachers: https://infourok.ru/biblioteka Editorial and publishing address: 214011, Russian Federation, Smolensk, Verkhne-Sennaya St., 4. [email protected] © 2012–2017 Publisher: Infourok Project