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khoapy2018
2 năm trước
1 phòng học dạng hình hộp chữ nhật có chiều dài 6m ,chiều rộng 4,5m và chiều cao 4m .Người ta muốn quét vôi trần nhà và 4 bức tường phía trong phòng . Biết rằng diện tích các cửa bằng 8,5 m2 . Hãy diện tích cần quét vôi?
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