Report - 1988 nat lic NAT, IONALA DE MATEMATIC˘ A˘ ETAPA NAT, IONALA, 1988˘ Clasa a IX-a 1. Se considera˘ un triunghi echilateral ABCde latura˘ 1 s, i punctele A1 ∈ (BC), B1 ∈ (AC),

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