4,7,9,10算24

4*[7-（10-9）]

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