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tranlongthienkim6396
2 năm trước
Từ một điểm A ở ngoài đường tròn O r vẽ hai tiếp tuyến AB và AC và các tuyến AM của đường tròn đó Gọi D là trung điểm của oa dây MN a chứng minh 5 điểm A B C D cùng nằm trên đường tròn
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