1: (4 - 4 ÷ 7) × 7=24 2: 〔4 - (4 ÷ 7)〕× 7=24 3: 7 × (4 - 4 ÷ 7)=24 4: 7 ×〔4 - (4 ÷ 7)〕=24
(8/（(8+8）/8)!
(3/7+3)*3
