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thanhlamvb2001
2 năm trước
cho tam giác ABC nhọn nội tiếp (O). Đường kính R , đường cao AE,BR giao nhau tại H 1; chứng minh 4 điểm A,E,B,F cùng nằm trên 1 đường tròn 2; chứng minh OC vuông góc với EF
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