99999×2=199998
999999×2=1999998
9999999×2=19999998
99999999×2=199999998
12345×9+6=111111
1234567×9+8=11111111
12345678×9+9=111111111
故答案为:199998,1999998,19999998,199999998,11111,6,1234567,8,12345678,9.
99999×2=199998
999999×2=1999998
9999999×2=19999998
99999999×2=199999998
12345×9+6=111111
1234567×9+8=11111111
12345678×9+9=111111111
故答案为:199998,1999998,19999998,199999998,11111,6,1234567,8,12345678,9.