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giang.happy
2 năm trước
Vẽ đường tròn tâm O bán kính R=2cm .Lấy 3 điểm A,B,C bất kì trên đường tròn .Vẽ các đoạn AB,BC,CA.Vẽ các đường trung trực của các đoạn thẳng AB,BC,CA
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