1:12 + 8 + 8 - 4
2:(12 + 8) + 8 - 4
3:(12 + 8 + 8) - 4
4:((12 + 8) + 8) - 4
5:(12 + (8 + 8)) - 4
6:12 + (8 + 8) - 4
7:12 + (8 + 8 - 4)
8:12 + ((8 + 8) - 4)
9:12 + (8 + (8 - 4))
10:12 + 8 +(8 - 4)
11:(12 + 8) + (8 - 4)
12:12 × (8 ÷ (8 - 4))
13:12 × 8 ÷(8 - 4)
14:(12 × 8) ÷ (8 - 4)