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cho tam giác ABC nội (AB<AC) nội tiếp đường tròn (O), đường cao CN và BM cắt nhau tại H, I là trung điểm của AH, K là trung điểm BC, Gọi E và F lần lượt trung điểm của BN và MC. Chứng minh IK đi qua trung điểm EF
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