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thuongquan1708
2 năm trước
cho (O) và 1 điểm A nằm ngoài đường tròn.Từ A kẻ tiếp tuyến AB và cát tuyến ACD(C nằm giữa A,D, O nằm trong góc BAD).Gọi E là trung điểm của CD,OE cắt CD tại M, BM cắt CD tại I,.Vẽ tiếp tuyến AN (N khác A),NE cắt (O) tại F. Chứng minh a)AB=AI b)BF//AD cần câu b thôi nha
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