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tulaanh
2 năm trước
Cho ΔABC ($\widehat{A}=90^0$). Kẻ $AH \bot BC$. E, F là hình chiếu của H trên AB, AC. a) Chứng minh rằng: AE . AB = AF . AC b) Chứng minh rằng: BH . HC = 4OE . OF (O là giao điểm của AH và EF)
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