November 2021 0 4 Report
На ребре СС1 куба АВСDA1B1C1D1 отмечена точка E так, что CE:EC1=2:1 Найдите угол между прямыми BEи AC1.
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odin iz kornej uravneniya 2x2326 raven 1 najdite vtoroj koren
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