cho tam giác abc cân tại a. Trên cạch BC lấy D,trên tia đối CB lấy E sao cho bd=ce. Từ D kẻ đường thảng vuông góc với BC cắt AB tại M, từ E kẻ vuông góc với BC cắt AC tại M
a, Chứng minh MD=ME
b,Gọi i là gđ MD và BE.Chứng minh I là trung điểm BE
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