Cho tam giác ABC có ba góc nhon, noi tiep đường tròn (O). Ba đường cao AD BE.CF của tam giác ABC cắt nhau tại H. Tia AH và AO cắt đường tròn tuơng ứng tại điểm thứ hai là K và M. Chứng minh a) MK//BC b) DH =vDK c) HM di qua trung điểm của BC

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