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kimchung.ace
2 năm trước
trên quả đồi có 1 cái tháp cao 100m.từ đỉnh B và chân C của tháp nhìn điểm A ở chân đồi dưới các góc tương ứng bằng60độ và 30độ so với phương nằm ngang. chiều cao của quả đồi là
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