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Vubalinh
2 năm trước
Cho ABC nội tiếp đường tròn tâm O. Các đường cao BD và CE cắt nhau tại H. Vẽ đường kính AK của đường tròn tâm O nói trên c/m tứ giác BHCK là hình bình hành c/m 4 điểm B, E, D, C thuộc 1 đường tròn Gọi M là trung điểm của BC. c/m AH = 2OM c/m: = BH.BD + CH. CE Giả sử BC = a, = . Tính DE theo a GIUP EM BAI TAP NAY VOI A
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