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linhngocnguyen0134
2 năm trước
Cho đường tròn tâm O, điểm A nằm ngoài đường tròn, đường thẳng AO cắt đường tròn tại 2 điểm là B ,C(AB < AC).qua A vẽ đường thẳng không đi qua O cắt đường tròn (O) tại 2 điểm phân biệt D,E(AD<AE). đường thẳng vuông với AB tại A cắt đường thẳng CE tại F.gọi M là giao điểm thứ 2 của đường thẳng FB với đường tròn (O),c/m DM vuông góc với AC
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