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phamthily118
2 năm trước
Cho tam giác ABC đều nội tiếp trong (O; R) . Các đường BO; CO cắt (O) lần lượt tại E và F. Trên AE lấy điểm M tùy ý không trùng A và E, các đường FM; BE cắt nhau tại N, OM cắt AN tại G Ch/m Tứ giác AGEO nội tiếp
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