Tìm số tự nhiên có 2 chữ số ,biết rằng lấy số đó chia cho c.số hàng đơn vị thì thương được là c.số hàng đơn vị và dư là c.số hàng chục [nhanh hộ mình nha,mình đang cần gấp] [c.số=chữ số]

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