July 2021 0 15 Report
Дано трапецию ABCD. Точка S не лежит в площади трапеции. Точки N и М принадлежат SB и SC соответственно. Причём SN : NB = SM : MC = 2 : 1. Доказать, что прямая MN паралельна площади ABC.
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