-12，-1，3，12 算24点，急！快！！！

(-12)*(-1)*3-12=24
(-12)/(-1)*3-12=24

呵呵，加油！

3*12-(-1)*(-12)=24
(-1)*(-12)*3-12=24

(3*(-12)+12)*(-1)=24
-12-12*(-1)*3=24

3*12-(-1)*(-12)=24
(-1)*(-12)*3-12=24

1: 12 × 1 × 3 - 12
2: (12 × 1) × 3 - 12
3: (12 × 1 × 3) - 12
4: ((12 × 1) × 3) - 12
5: (12 × (1 × 3)) - 12
6: 12 × (1 × 3) - 12
7: 12 ÷ 1 × 3 - 12
8: (12 ÷ 1) × 3 - 12
9: (12 ÷ 1 × 3) - 12
10: ((12 ÷ 1) × 3) - 12
11: (12 ÷ (1 ÷ 3)) - 12
12: 12 ÷ (1 ÷ 3) - 12
13: 12 × 3 - 1 × 12
14: (12 × 3) - 1 × 12
15: 12 × 3 -(1 × 12)
16: (12 × 3) - (1 × 12)
17: 12 × 3 × 1 - 12
18: (12 × 3) × 1 - 12
19: (12 × 3 × 1) - 12
20: ((12 × 3) × 1) - 12
21: (12 × (3 × 1)) - 12
22: 12 × (3 × 1) - 12
23: 12 × 3 ÷ 1 - 12
24: (12 × 3) ÷ 1 - 12
25: (12 × 3 ÷ 1) - 12
26: ((12 × 3) ÷ 1) - 12
27: (12 × (3 ÷ 1)) - 12
28: 12 × (3 ÷ 1) - 12