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Author:
Василь Ярошевич
В параллелограме ABCD ВС = 2АВ, М ‒ середина AD, Е ‒ основание перпендикуляра, опущенного из вершины С на сторону АВ. Доказать, что ∠DME = 3∠АЕМ.
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