2/ Người ta thuê quét vôi bên trong một căn phòng hình hộp chữ nhật gồm tường và trần nhà. Phòng dài 12,5m ; rộng 4m và cao 3,2 m. Phòng có diện tích các cửa là 12,5m2 . Hỏi: a/ Diện tích cần quét vôi? b/ Trung bình, một mét vuông sơn nước là 15000 đồng. Hỏi số tiền phải trả để sơn nước căn phòng là bao nhiêu?

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