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2 năm trước
Một tàu phát ra sóng siêu âm để đo độ sâu của đáy biển.Biết thời gian kể từ lúc phát ra siêu âm đến lúc thu lại được âm phản xạ là 1,5 phút.Tính độ sâu của biển?Biết vận tốc sóng siêu âm trong nước biển là 1500m/s
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