2594,把这四个数字组成24，随便加减乘除，但不能重复数字，怎么组啊？

Question

2年级数学作业，知道请立刻回答，谢谢咯O(∩_∩)O

Answer 1

1: (2 + 9 - 5) × 4
2: ((2 + 9) - 5) × 4
3: (2 + (9 - 5)) × 4
4: (2 × (9 + 5)) - 4
5: 2 × (9 + 5) - 4
6: (2 - 5 + 9) × 4
7: ((2 - 5) + 9) × 4
8: (2 - (5 - 9)) × 4
9: (2 × (5 + 9)) - 4
10: 2 × (5 + 9) - 4
11: (2 + 4) × (9 - 5)
12: (9 + 2 - 5) × 4
13: ((9 + 2) - 5) × 4
14: (9 + (2 - 5)) × 4
15: (9 + 5) × 2 - 4
16: ((9 + 5) × 2) - 4
17: (9 - 5 + 2) × 4
18: ((9 - 5) + 2) × 4
19: (9 - (5 - 2)) × 4
20: (9 - 5) × (2 + 4)
21: (9 - 5) × (4 + 2)
22: (5 + 9) × 2 - 4
23: ((5 + 9) × 2) - 4
24: (4 + 2) × (9 - 5)
25: 4 × (2 + 9 - 5)
26: 4 × ((2 + 9) - 5)
27: 4 × (2 + (9 - 5))
28: 4 × (2 - 5 + 9)
29: 4 × ((2 - 5) + 9)
30: 4 × (2 - (5 - 9))
31: 4 × (9 + 2 - 5)
32: 4 × ((9 + 2) - 5)
33: 4 × (9 + (2 - 5))
34: 4 × (9 - 5 + 2)
35: 4 × ((9 - 5) + 2)
36: 4 × (9 - (5 - 2))

Answer 2

(9+2-5)×4=24