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lanvp83
2 năm trước
Cho tam giác ABC đều, đường cao AH. Trên tia HD lấy điểm C sao cho HD = HA. Trên nửa mặt phẳng bờ BD không chứa điểm A vẽ tia Dx sao cho BDx =15 độ .Dx cắt AB tại E. Chứng minh HD = HE
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