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thuanloga
2 năm trước
Môt lớp học dang hình hôp chư nhật có chiều dài 9 m, chiều rông 6,5 m và chiều cao 4 m. Người ta quet vôi trân và tường bên trong lớp học. Tinh diên tich phân cân quet vôi, biêt răng tông diên tích các cửa sô và cửa ra vào là 10,4 m2. (2 điểm)
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