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vyphucat2
2 năm trước
Trên đường tròn (O) đường kính AB lấy điểm M (khác A,B) vẽ tiếp tuyến của đường tròn(O) tại A,đường thẳng MB cắt tiếp tuyến đó tại C.Chứng minh MA bình =MB.MC
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