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Задача 56: Автор - Григорий Забазнов Источник: MGO 2024, задача 4
На сторонах AB и AC треугольника ABC выбраны точки E и F соответственно так,что B,E,F,C лежат на одной окружности. Прямые BF и CE пересекаются в точке K. Отражение прямой AK относительно биссетрисы угла BAC пересекает BF и CE в точках M и N. Доказать, что если окружность (MKN) касается BC, то она касается и EF.
Задача 56: Автор - Григорий Забазнов Источник: MGO 2024, задача 4
На сторонах AB и AC треугольника ABC выбраны точки E и F соответственно так,что B,E,F,C лежат на одной окружности. Прямые BF и CE пересекаются в точке K. Отражение прямой AK относительно биссетрисы угла BAC пересекает BF и CE в точках M и N. Доказать, что если окружность (MKN) касается BC, то она касается и EF.
At this point, however, Durov had already been working on Telegram with his brother, and further planned a mobile-first social network with an explicit focus on anti-censorship. Later in April, he told TechCrunch that he had left Russia and had “no plans to go back,” saying that the nation was currently “incompatible with internet business at the moment.” He added later that he was looking for a country that matched his libertarian ideals to base his next startup. That hurt tech stocks. For the past few weeks, the 10-year yield has traded between 1.72% and 2%, as traders moved into the bond for safety when Russia headlines were ugly—and out of it when headlines improved. Now, the yield is touching its pandemic-era high. If the yield breaks above that level, that could signal that it’s on a sustainable path higher. Higher long-dated bond yields make future profits less valuable—and many tech companies are valued on the basis of profits forecast for many years in the future. The Russian invasion of Ukraine has been a driving force in markets for the past few weeks. To that end, when files are actively downloading, a new icon now appears in the Search bar that users can tap to view and manage downloads, pause and resume all downloads or just individual items, and select one to increase its priority or view it in a chat. Telegram was founded in 2013 by two Russian brothers, Nikolai and Pavel Durov.
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