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vuhuong73
2 năm trước
Cho điểm A nằm ngoài đường tròn (O;R) . Vẽ các tuyến AB,AC và cắt tuyến ADE. Tia phân giác DBE cắt DE ở M. Chứng minh rằng : a. AB bình phương =AD.AE b. AB=AM c. CM là tia phân giác của góc DCE
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