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tthaiha
2 năm trước
Một căn phòng dạng hình hộp chữ nhật có chiều dài 10m, chiều rộng 7 m và chiều cao 4 m. Người ta muốn sơn trần nhà và bốn bức tường phía trong phòng, biết rằng diện tích các ô cửa là 10,5 m2 . Diện tích cần sơn là
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