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người ta dùng các tấm nhựa xốp hình vuông cạnh 30cm để trải kín nền 1 căn phòng hình chữ nhật . Có chiều dài 6m , chiều rộng 4m5dm . biết rằng mỗi tấm đó có giá 2000 đồng . Hỏi phải tốn bao nhiêu tiền để mua đủ các tấm nhựa xốp đó ?
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