10.7.7.2 24点

1:(10 ÷ 7 + 2) × 7
2:((10 ÷ 7) + 2) × 7
3:(2 + 10 ÷ 7) × 7
4:(2 + (10 ÷ 7)) × 7
5:7 × (10 ÷ 7 + 2)
6:7 × ((10 ÷ 7) + 2)
7:7 × (2 + 10 ÷ 7)
8:7 × (2 + (10 ÷ 7))