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Hoang819
2 năm trước
cho tam giác ABC cân tại A kẻ AH vuông góc với BC ( H THUỘC BC) a) c/m HB = HC. b) kẻ HD vuông góc với AB ( D ∈AB) , HE ⊥AC ( E ∈ AC) CHỨNG MINH tam giác HDE CÂN
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