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2 năm trước
Cho tam giác đều ABC.gọi O là tâm của đường tròn đi qua 3 đỉnh A,B, C a) tính số đo các góc ở tâm tạo bởi 2 trong 3 bán kính OA OB OC b) tính số đo cung AB,Ac,BC
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