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Phanthimailam
2 năm trước
Diện tích toàn phần của hình lập phương thứ nhất là 54 cm vuông, diện tích toàn phần của hình lập phương thứ hai là 216 cm vuông. Vậy Cạnh hình lập phương thứ hai dài gấp số lần cạnh hình lập phương thứ nhất là:
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