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dinhthithuong26021990
2 năm trước
Cho (O, R) đường kính AB. H thuộc OB. Dây CD vgoc AB tại H. d tiếp xúc (O) tại A. CO, DO cắt d tại M và N. CM, DN cắt (O) tại E và F. a) Chứng minh EF // CD; MNFE là thang cân; MNFE nội tiếp và ME=NF,ME.MC=NF.ND b) Gọi K là giao của EF và OA. Chứng minh K là TĐ của EF. Tìm vị trí của H để AEOF là thoi.
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