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hungalan66
2 năm trước
Người ta quét sơn một căn phòng hình hộp chữ nhật có chiều dài 8m, rộng 5,5m và chiều cao 3,6m. Biết diện tích các cửa là 12,5m2.Tính. a/Diện tích cần quét sơn của căn phòng? B/cầ sử dụng bao nhiêu kg sơ? Biết sơn 1m2 thì cần 0,2 kg sơn.
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