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