Một lớp học dài 9m rộng 6m cao 5m. Trong lớp người ta quét vôi trần nhà và bốn bức tường. Trên 4 mặt tường có 2 cửa sổ và 1 cửa ra vào. Cửa sổ hình vuông mỗi cạnh 1,5m, cửa ra vào HCN rộng 1,6m cao 2,5m. Như vậy diện tích cần quét vôi trong lớp là? cảm ơn mng !!!!!!!!!!!!!!!!!!!!

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