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Замкнутая четырехзвенная ломаная описана вокруг сферы. Доказать, что точки касания лежат в одной плоскости.

// П.Пушкарь напомнил такую задачу с ММО-1950



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Замкнутая четырехзвенная ломаная описана вокруг сферы. Доказать, что точки касания лежат в одной плоскости.

// П.Пушкарь напомнил такую задачу с ММО-1950

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Crude oil prices edged higher after tumbling on Thursday, when U.S. West Texas intermediate slid back below $110 per barrel after topping as much as $130 a barrel in recent sessions. Still, gas prices at the pump rose to fresh highs. As the war in Ukraine rages, the messaging app Telegram has emerged as the go-to place for unfiltered live war updates for both Ukrainian refugees and increasingly isolated Russians alike. In 2014, Pavel Durov fled the country after allies of the Kremlin took control of the social networking site most know just as VK. Russia's intelligence agency had asked Durov to turn over the data of anti-Kremlin protesters. Durov refused to do so. The channel appears to be part of the broader information war that has developed following Russia's invasion of Ukraine. The Kremlin has paid Russian TikTok influencers to push propaganda, according to a Vice News investigation, while ProPublica found that fake Russian fact check videos had been viewed over a million times on Telegram. I want a secure messaging app, should I use Telegram?
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