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