1: (2 + 7) × 4 - 12
2: ((2 + 7) × 4) - 12
3: (4 × (2 + 7)) - 12
4: 4 × (2 + 7) - 12
5: (4 × (7 + 2)) - 12
6: 4 × (7 + 2) - 12
7: (7 + 2) × 4 - 12
8: ((7 + 2) × 4) - 12
9: 12 ÷ (4 - 7 ÷ 2)
10: 12 ÷ (4 - (7 ÷ 2))
1、 (2 + 7) × 4 - 12 2、(2 + 7) × 4) - 12
3、 (4 × (2 + 7)- 12 4、 4 × (2 + 7) - 12
5、 (4 × (7 + 2) - 12 6、 4 × (7 + 2) - 12
7、(7 + 2) × 4 - 12 8、(7 + 2) × 4) - 12
4!*(7-12/2)
4!:4*3*2*1等于24