2018_09_11 - 89,90 лек. А.В.Савватеева - Волшебство К.Ф.Гаусса: построение правильного 17-угольника
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![Коротко о главном []](https://sun9-75.userapi.com/c844618/v844618922/ea9c4/7Eg3w2_vjcE.jpg)
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