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	Các bình luận về: Đề: Một đại lý xăng dầu cần làm một bồn chứa dầu hình trục có đáy và nắp đậy bằng tôn với thể tích \(16\pi \left( {{m^3}} \right)\). Biết rằng giá thành (cả vật liệu và tiền công) được tính theo mét vuông, tìm đường kính đáy của bồn để đại lý phải trả ít chi phí nhất.	</title>
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