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armycr0
2 năm trước
Cho tam giác ABC có đường cao AH(H thuộc BC) a,CM BHA đồng dạng AHC b,AB^2=BC×BH c,Tia phân giác HAC cắt BC tại D.Qua D kẻ đường vuông góc với AD,đường thẳng này cắt AB ở E.CM AB=BE
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