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Thanhhang1234
2 năm trước
Một bể cá hình hộp chữ nhật có chiều daif1,5m , chiều rộng 0,8m , chiều cao 1,2m.Hỏi phải bơm vào bể bao nhiêu lít nước để chiều cao cột nước chiếm 80% chiều cao của bể?
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