1:(7 - 1) ÷ 3 × 12=24 2:((7 - 1) ÷ 3) × 12=24 3:(7 - 1) ÷ (3 ÷ 12)=24 4:(7 - 1) × 12 ÷ 3=24 5:((7 - 1) × 12) ÷ 3=24 6:(7 - 1) × (12 ÷ 3)=24 7:12 ÷ 3 ×(7 - 1)=24 8:(12 ÷ 3) × (7 - 1)=24...