Конкурс «Страницы семейной летописи»
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![Физика ОГЭ: сила упругости, закон Гука, решение задач | 8, 9 класс [ CLIP #1 по физике ]](https://sun9-22.userapi.com/w5y28CFmxnGOIQmbU9ZihJ51bA_5PEz25PRNug/SVjV77Zb4u8.jpg)
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