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Buivansang
2 năm trước
làm hộ mình với ạ ^^ có tam giác ABC cân tại A , AD vuông góc với BC ( Dthuộc BC) DH vuông góc với AB tại H , DK vuông góc với AC tại K , tam giác AHK là tam giác cân A) chứng minh HK // BC B)AB= 10 cm , BC= 12cm tính AD
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