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mocphi1234
2 năm trước
Cho tam giác ABC (AB > AC), M là trung điểm của BC. Đường thẳng vuông góc với tia phân giác của góc A tại M cắt cạnh AB, AC lần lượt tại E và F. Từ C kẻ đường thẳng song song với AB và cắt EF tại D. Chứng minh a) BME = CMD b) AEF, CDF là các tam giác cân ( Vẽ hình lun nha)
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