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bienhuy234
2 năm trước
để lát nền 1 phòng học hình chữ nhật có chiều dài 15 m chiều rộng 6m người ta dùng loại gạch men hình vuông có cạnh 30 cm . Giá mỗi viên gạch là 2 500 đồng . Hỏi hết bao nhiêu tiền để lát kín phòng học đó biết phần gạch vữa không đáng kể .
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