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ndkhoa277
2 năm trước
cho tam giác abc đều nội tiếp đường tròn o gọi AI là đg kính cố định và D là điểm di động trên cung nhỏ AC (D khác A;C) a) tính cạnh tam giác ABC theo R b)CM: AI là phân giác góc BAC c)Trên DB lấy DE=DC. CM:DI vuông góc với DE
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