80.
-
8 ve 9
(0 x 9) + 8 = 8
(9 x 9) + 7 = 88
(98 x 9) + 6 = 888
(987 x 9) + 5 = 8888
(9876 x 9) + 4 = 88888
(98765 x 9) + 3 = 888888
(987654 x 9) + 2 = 8888888
(9876543 x 9) + 1 = 88888888
(98765432 x 9) + 0 = 888888888
(987654321 x 9) - 1 = 8888888888.
