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hanikezi
2 năm trước
Người ta xếp những hình Lập phương nhỏ cạnh 1cm thành một Hình hộp chữ nhật dài 6cm, rộng 4cm, cao 5 cm , rồi sơn cả 6 mặt ngoài của hình hộp đó . Hỏi có bao nhiêu hình lập phương được sơn? a)1 mặt b)2 mặt
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