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loivinh2001
2 năm trước
Câu5.ChohaiđiểmA,Bcáchnhau3cm.Vẽđườngtròn(A;2,5cm)và đường tròn(B; 1,5cm).Hai đường tròn này cắt nhau tại C và D. a. Tính CA, DB. b.Đườngtròn(B;1,5cm) cắt AB tạị I .I có là trung điểm của AB không tại sao?
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