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2 năm trước
Cho Δ ABC nhọn nội tiếp đường tròn (O). Các đường cao AD, BE, CF của Cho Δ ABC cắt nhau tại H. 1, Chứng minh AF.AB = AE . AC 2, Chứng minh DH là tia phân giác của góc EDF. 3, Giả sử góc ACB = 60độ , chứng minh 2EF + BF = √3 . CF
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