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Cho tam giác nhọn ABC (AB < AC). Gọi M là trung điểm của BC. Trên tia đối của tia MA lấy điểm D sao cho MD = MA. a) Chứng minh DABM = DDCM. b) Kẻ AH vuông góc với BC (H Î BC). Vẽ điểm E sao cho H là trung điểm của EA. Chứng minh BE = CD.
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