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long123yut
2 năm trước
Cho 2 đường tròn (O1) và (O2) tiếp xúc ngoài ở K. Vẽ tiếp tuyến chung ngoài AD với 2 đường tròn (A thuộc (O1), B thuộc (O2). Vẽ đường kính AO1B, qua B vẽ tiếp tuyến BM với đường tròn (O2).CMR a) B,K,D thẳng hàng
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