问一道初一数学题，数学好的进来！急啊！！

共72种:
1: 10 × 2 - 9 + 13
2: (10 × 2) - 9 + 13
3: (10 × 2 - 9) + 13
4: ((10 × 2) - 9) + 13
5: 10 × 2 -(9 - 13)
6: (10 × 2) - (9 - 13)
7: 10 × 2 + 13 - 9
8: (10 × 2) + 13 - 9
9: (10 × 2 + 13) - 9
10: ((10 × 2) + 13) - 9
11: 10 × 2 +(13 - 9)
12: (10 × 2) + (13 - 9)
13: (9 - 10 + 13) × 2
14: ((9 - 10) + 13) × 2
15: (9 - (10 - 13)) × 2
16: (9 + 13 - 10) × 2
17: ((9 + 13) - 10) × 2
18: (9 + (13 - 10)) × 2
19: 2 × 10 - 9 + 13
20: (2 × 10) - 9 + 13
21: (2 × 10 - 9) + 13
22: ((2 × 10) - 9) + 13
23: 2 × 10 -(9 - 13)
24: (2 × 10) - (9 - 13)
25: 2 × 10 + 13 - 9
26: (2 × 10) + 13 - 9
27: (2 × 10 + 13) - 9
28: ((2 × 10) + 13) - 9
29: 2 × 10 +(13 - 9)
30: (2 × 10) + (13 - 9)
31: 2 × (9 - 10 + 13)
32: 2 × ((9 - 10) + 13)
33: 2 × (9 - (10 - 13))
34: 2 × (9 + 13 - 10)
35: 2 × ((9 + 13) - 10)
36: 2 × (9 + (13 - 10))
37: 2 × (13 - 10 + 9)
38: 2 × ((13 - 10) + 9)
39: 2 × (13 - (10 - 9))
40: 2 × (13 + 9 - 10)
41: 2 × ((13 + 9) - 10)
42: 2 × (13 + (9 - 10))
43: (13 - 10 + 9) × 2
44: ((13 - 10) + 9) × 2
45: (13 - (10 - 9)) × 2
46: 13 + 10 × 2 - 9
47: (13 + 10 × 2) - 9
48: (13 + (10 × 2)) - 9
49: 13 + (10 × 2) - 9
50: 13 + (10 × 2 - 9)
51: 13 + ((10 × 2) - 9)
52: (13 + 9 - 10) × 2
53: ((13 + 9) - 10) × 2
54: (13 + (9 - 10)) × 2
55: 13 - 9 + 10 × 2
56: (13 - 9) + 10 × 2
57: 13 - 9 +(10 × 2)
58: (13 - 9) + (10 × 2)
59: 13 - (9 - 10 × 2)
60: 13 - (9 - (10 × 2))
61: 13 - 9 + 2 × 10
62: (13 - 9) + 2 × 10
63: 13 - 9 +(2 × 10)
64: (13 - 9) + (2 × 10)
65: 13 - (9 - 2 × 10)
66: 13 - (9 - (2 × 10))
67: 13 + 2 × 10 - 9
68: (13 + 2 × 10) - 9
69: (13 + (2 × 10)) - 9
70: 13 + (2 × 10) - 9
71: 13 + (2 × 10 - 9)
72: 13 + ((2 × 10) - 9)

(10*2)-(9-13)
((10*2)-9)+13
((10*2)+13)-9
(10*2)+(13-9)
(9-(10-13))*2
((9-10)+13)*2
((9+13)-10)*2
(9+(13-10))*2
(2*10)-(9-13)
((2*10)-9)+13
((2*10)+13)-9
(2*10)+(13-9)
2*(9-(10-13))
2*((9-10)+13)
2*((9+13)-10)
2*(9+(13-10))
2*(13-(10-9))
2*((13-10)+9)
2*((13+9)-10)
2*(13+(9-10))
(13-(10-9))*2
((13-10)+9)*2
13+((10*2)-9)
(13+(10*2))-9
13-(9-(10*2))
(13-9)+(10*2)
((13+9)-10)*2
(13+(9-10))*2
13-(9-(2*10))
(13-9)+(2*10)
13+((2*10)-9)
(13+(2*10))-9

13-9=4,2X10=20,20+4=24

10 × 2 - 9 + 13=24

(9 + 13 - 10) × 2=24

2脳10+(13-9)