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avahn23
2 năm trước
một bể nước dạng hình hộp chữ nhật có chiều dài 8m chiều rộng 1/2 chiều dài, chiều cao 5m. người ta chứa nước chiếm 80% thể tích của bể. hỏi thể tích nước trong bể là bao nhiêu?
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