Bài 13: Tìm số tự nhiên có 2 chữ số biết rằng khi viết thêm chữ số 3 vào bên trái và chữ số 5 vào bên phải thì số đó tăng thêm 3617 đơn vị. Bài 14:Một số tự nhiên có bốn chữ số hàng nghìn là 2, chữ số hàng trăm là 0, khi chuyển số 20 sang bên phải thì số đó giảm đi 594 đơn vị. Tìm số tự nhiên đó

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