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