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marywhooley7w
2 năm trước
Bài 4 : Cho ∆ ABC vuông tại A đường phân giác BD , kẻ DE vuông góc với BC ( E thuộc BC ) a, Chứng minh ∆ ABD = ∆ EBD b, Chứng minh : BD là đường trung trực AE c, Qua C kẻ đường thẳng vuông góc với BC cắt BD tại F . Chứng minh ∆ CDF cân d, Gọi I là trung điểm của DF . Chứng minh AB , DE , CI cùng đi qua 1 điểm
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