1) 12:3 = 4.
2) 1*2*3+4-5 = 5.
3) 12:3:4+5 = 6.
4) (1-2)+3+4-5+6 = 7.
5) 1*2*3-4+5-6+7 = 8.
6) 1*2+3+4-5+6+7-8 = 9.
1) 12:3 = 4.
2) 1*2*3+4-5 = 5.
3) 12:3:4+5 = 6.
4) (1-2)+3+4-5+6 = 7.
5) 1*2*3-4+5-6+7 = 8.
6) 1*2+3+4-5+6+7-8 = 9.