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Loga20199999
2 năm trước
Một phòng học dạng hình hộp chữ nhật có chiều dài 8m,chiều rộng 6m,chiều cao 3,5m.Người ta sơn trần và bốn bức tường phía trong phòng.Tính diện tích quét sơn,biết rằng diện tích các cửa là 12m2
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