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duongdieu2002
2 năm trước
cho ∆ABC cân tại A.Trên cạnh BC lấy 2 điểm D và E(D nằm giữa B và E) và BD=DE=EC.Chứng minh rằng : góc BAD=góc CAE bé hơn hoặc bằng góc DAE
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