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Câu 6: Cho tam giác ABC cân tại A. Kẻ BD vuông góc với AC, CE vuông góc với AB. BD và CE cắt nhau tại H. Có Tam giác ABD-tam giác ACE. Tam giác BHC cân. Tính c, ED//BC d, AH căt BC tại K, trên HK lấy M sao cho K là trung điểm của HM.Chứng minh tam giác ACM
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