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Mathematics, 24.07.2021 16:00 falgunim4

Ba đường phân giác của tam giác ABC gặp nhau tại O phát biểu nào sau đây đúng A Ao luôn vuông góc với BC
B OA=OB=OC
C Ao luôn đi qua trung điểm BC
D O cách đều ba cạnh của tam giác

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