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duongthuhuong
2 năm trước
1 bể nước dạng hình hộp chữ nhật có kích thước trong lòng bể là.chiều dài 10m,chiều rộng 5m,chiều cao 2m nước đã được đổ tới 4/5 bể.hỏi phải đổ thêm vào bể bao nhiêu lít nước nữa mới đầy bể
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