Подготовка к ОГЭ 2020. Математика. Часть 2.
Тема: Углы.
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![008. Что приводит к смене формаций [научный социализм в вопросах и ответах]](https://sun9-3.userapi.com/W-UDGEgNgU1p2PK2xVvhZ0oCjt8BZZgRV6gFXg/lPdW93-2rGQ.jpg)
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