填写加减等数学符号,使式子成立:2 2 4 4 =24

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

2×（2×4+4）=24，此法准确；
2×（4-2）×4=24 ，此法调整了数字顺序，不知道算不算。

2*(2*4+4)=24

[2X4-2]X4=24

2*（2*4+4）=24
（2*4-2）*4=24
2^4+2*4=24
4^2+2*4=24

(2*4-2)*4=24

2×（2×4+4）=24

2×（2×4+4）=2