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nguyen.eizzi
2 năm trước
Một bể nước hình hộp chữ nhật có chiều dài 2m. Lúc đầu bể không có nước. Sau khi đổ vào bể 2400 lít nước thì mực nước của bể cao 0.8m. Hãy tính chiều rộng của bể nước.
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