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phamvanthuan.06061976
2 năm trước
Cho tam giác ABC có AB=AC . Tia phân giác của góc BAC cắt cạnh BC tại H . Gọi M và N thứ tự là trung điểm của cạnh AB và AC . Trên tia đối của tia MH lấy điểm D sao cho MD =MH . Trên tia đối của tia NH lấy điểm E sao cho NH=NE . Chứng minh rằng : a) Tam giác ABH = tam giác ACH b)AE //BC Ba điểm A,D,E thẳng hàng VẼ DÙM MÌNH HÌNH VẼ NHA
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