120x12?
1440
12121212121212121+1?
12121212121212122
9x1200?
10800
123456789+1?
123456790
3x1200?
3600
121*11
11
1200x12?
14400
9999999999+1?
10000000000
6x1200?
7200
1+2+3+4+5+6+7+8+9?
45