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quang2006hk
2 năm trước
tìm số tự nhiên n có hai chữ số,biết rằng tổng các chữ số của nó bằng 9;và nếu cộng thêm vào số đó 63 đơn vị thì đc 1 số mới cũng viết bằng 2 chữ số đó theo thứ tự ngược lại
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