84.
-
1 x 8 + 1 = 9
12 x 8 + 2 = 98
123 x 8 + 3 = 987
1234 x 8 + 4 = 9876
12345 x 8 + 5 = 98765
123456 x 8 + 6 = 987654
1234567 x 8 + 7 = 9876543
12345678 x 8 + 8 = 98765432
123456789 x 8 + 9 = 987654321
142 857.
142 857 x 1 = 142 857
142 857 x 2 = 285 714
3 = 428 571
4 = 571 428
5 = 714 285
6 = 857 142
7 ? 999 999.
142 + 857 = 999,
14 + 28 + 57 = 99.
142 857 ? 20408122449.
20408+122449 = 142 857
111111111 x 111111111 = 12345678987654321.
vaybe!.
