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truongtukiet1248
2 năm trước
Cho ABC vuông tại A (AB < AC). Trên cạnh BC lấy điểm D sao cho BD = BA. Qua D kẻ đường thẳng vuông góc với BC, cắt cạnh AC tại E. a) Chứng minh rằng: BE là tia phân giác của góc ABD. b) Gọi I là giao điểm của BA và DE. Chứng minh: cân.
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