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win102
2 năm trước
Cho tam giác ABC(AB<AC) có hai đường cao BD và CE cắt nhau tại trực tâm H. Chứng minh 4 điểm B,D,C,E cùng nằm trên 1 đường tròn.Xác định tâm I của đường tròn đó.
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