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Lanhuong23
2 năm trước
giúp mik nha m.n một phòng học dạng HHCN có chiều dài 6m , chiều rộng 4,5 m và chiều cao là 4 m . Người ta muốn quét vôi trần nhà và phía trog và ngoài của 4 bức tường . Biết diện tích cửa là 8,5 m2 . Tính diện tích cần quét vôi
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