Tìm 4 chữ số khác biệt.
999999999999999999999989999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999499999999999999999999999999999999999999999999999999999999999999999599999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999969999999999999999999999999999999
Các chữ số khác biệt: 8 ở dòng 1, 4 ở dòng 3, 5 ở dòng 4, 6 ở dòng 5.
k mk nha cảm ơn.
câu trả lời là : 8,4,5,6