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letrungphuoc1987
2 năm trước
Cho tam giác ABC cân tại A. I là trung điểm của AB, K là trung điểm của AC a, Vẽ hình b, Chứng minh BK = CI c, BK cắt CI tại O. CM tam giác OIB = Tam giác OKC d, CM: AO là p/g của góc BAC
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