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wwkhacthang
2 năm trước
Tìm số tự nhiên có hai chữ số số biết hai lần chữ số hàng đơn vị kém hơn chữ số hàng chục là 2 khi viết hai chữ số của số ban đầu theo thứ tự ngược lại thì số ban đầu lớn hơn số mới là 36
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