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hoctrogioi456
2 năm trước
Bài 1: Một căn phòng dạng hình hộp chữ nhật có chiều dài 9 m, chiều rộng 6 m và chiều cao 4,5 m. Người ta quét sơn trần và xung quanh mặt trong của căn phòng. Tính diện tích cần quét sơn biết diện tích các cửa là 10,5 m vuông
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