Vũ Mạnh Hùng
03/12/2017 at 10:59-
Nguyễn Hưng Phát 03/12/2017 at 11:23We have:9*9*9*........*9 (345 number 9)
=9345=9344 * 9=(92)172 * 9=81172 * 9=..............1 * 9=...............9
Answer:the last number of 9*9*9*...........*9 is:9