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2 năm trước
Một phòng học lớp 5 tại trường Tiểu học Trưng Trắc có chiều dài 6m,chiều rộng 4,5m và chiều cao là 4m.Người ta muốn quét sơn 4 bức tường phía trong phòng học.Biết rằng diện tích các cửa bằng 8,5m2. a)Tính diện tích cần quét sơn phòng học. b)Với giá tiền sơn là cứ 10 mét vuông thì hết 390 000 đồng.Hỏi sơn hết phòng học đó là bao nhiêu tiền?
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