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nghiango
2 năm trước
Cho Δ ABC vuông tại A . M là trung điểm của BC , qua M kẻ đường thẳng vuông góc với BC cắt AC ở D . Lấy E sao cho A là trung điểm của ED . Các đường thẳng MA,BE cắt nhau tại F . C/m a) Δ BDC cân tại D b) Góc BEC = 2 x góc BCE c) AM = 12 DC và BF = AC c/m bf = ac thôi
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