1:(12 × (13 + 3)) ÷ 8=24
2:12 × (13 + 3) ÷ 8=24
3:12 × ((13 + 3) ÷ 8)=24
4:12 × (13 - (3 + 8))=24
5:12 × (13 - 3 - 8)=24
6:12 × ((13 - 3) - 8)=24