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2 năm trước
Cho tam giác ABC ( AB<AC ). Vẽ tia p/g AD của tam giác ABC (D ∈ BC). Trên cạnh AC lấy điểm E / AE = AB a/ CM tam giác ADB = tam giác ADE b/ CM AD la đường trung trực của BE c/ Gọi F là giao điểm của AB và DE . CM góc DBF = góc DEC và tam giác BFD = tam giác ECD (Có vẽ hình) Gấp
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