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lekuppy102
2 năm trước
cho tam giác ABC nhọn , nội tiếp trong đường tròn (o) từ Bvà C kẻ 2 tiếp tuyến với đường tròn .Chúng cắt nhau tại D.Từ D kẻ cát tuyến song song với AB cát đường tròn tại E và F và cắt AC tại I a: chứng minh DOC=BAC b: chứng minhh 4 điểm O,I,C,D nằm trên 1 đường tròn c:IE=IF d:cho B,C cố định ,và đường tròn (o) cố định , khi A chuyển động trên cung BC lớn thì I di chuyển trên đường tròn nào
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