共有8种：
1:(2 × (3 + 10)) - 2
2:2 × (3 + 10) - 2
3:(2 × (10 + 3)) - 2
4:2 × (10 + 3) - 2
5:(3 + 10) × 2 - 2
6:((3 + 10) × 2) - 2
7:(10 + 3) × 2 - 2
8:((10 + 3) × 2) - 2