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