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haiyenngulol3
2 năm trước
Tìm một số tự nhiên có hai chữ số sao cho tổng của hai chữ số của nó bằng 17,chữ số hàng chục là 4,nếu đổi chỗ các chữ số hàng trăm và hàng đơn vị cho nhau thì số đó giảm đi 99 đơn vị.(hứa vote 5s)
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