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tranthikimhieutq
2 năm trước
3. Cho AABC cân tại A. Lấy điểm D trên canh AB, điểm E trên cạnh AC sao cho BD=CE.Chứng minh rằng: a,DE // BC b, AABE = AACD c, Gọi I là giao điểm của BE và CD.Chứng Minh: ABID = ACIE d, AI là phân giác của góc A e, AI vuông DE
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