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vthn2711
2 năm trước
Ba thành phố A, B, C ở 3 địa điểm là 3 đỉnh của một tam giác đều, biết rằng AB = 30 km. Người ta muốn xây dựng một đài truyền hình tại vị trí cách đều ba thành phố A, B, C. Khoảng cách từ đài truyền hình tới thành phố A là * A B Cái nào đúng ạ?
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