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john.nguyen.hp68
2 năm trước
Cho nửa đường tròn O, đường kính AB=2R. Vẽ đường tròn tâm K đường kính OB a) CM: Hai đường tròn O và K tiếp xúc nhau b) Vẽ dây BD của đường tròn O ( BD khác đường kính) dây BD cắt đường tròn K tại M. CM: KM//OD
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