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duydetrai
2 năm trước
Cho tam giác abc có AB=BC.Trên cạnh AC lấy điểm D sao cho AB=AD. M là trung điểm của BD. AM cắt BC tại K. CHỨNG MINH: a, tam giác AMB= tam giác AMD. b, AM vuông góc với BD c,CM tam giác BKD là am giác cân
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