用4、5、9、7算24点

1:4 × 9 -(5 + 7)
2:(4 × 9) - (5 + 7)
3:4 × 9 - 5 - 7
4:(4 × 9) - 5 - 7
5:(4 × 9 - 5) - 7
6:((4 × 9) - 5) - 7
7:4 × 9 -(7 + 5)
8:(4 × 9) - (7 + 5)
9:4 × 9 - 7 - 5
10:(4 × 9) - 7 - 5
11:(4 × 9 - 7) - 5
12:((4 × 9) - 7) - 5
13:4 × 7 + 5 - 9
14:(4 × 7) + 5 - 9
15:(4 × 7 + 5) - 9
16:((4 × 7) + 5) - 9
17:4 × 7 +(5 - 9)
18:(4 × 7) + (5 - 9)
19:4 × 7 - 9 + 5
20:(4 × 7) - 9 + 5
21:(4 × 7 - 9) + 5
22:((4 × 7) - 9) + 5
23:4 × 7 -(9 - 5)
24:(4 × 7) - (9 - 5)
25:5 + 4 × 7 - 9
26:(5 + 4 × 7) - 9
27:(5 + (4 × 7)) - 9
28:5 + (4 × 7) - 9
29:5 + (4 × 7 - 9)
30:5 + ((4 × 7) - 9)
31:5 - 9 + 4 × 7
32:(5 - 9) + 4 × 7
33:5 - 9 +(4 × 7)
34:(5 - 9) + (4 × 7)
35:5 - (9 - 4 × 7)
36:5 - (9 - (4 × 7))
37:5 - 9 + 7 × 4
38:(5 - 9) + 7 × 4
39:5 - 9 +(7 × 4)
40:(5 - 9) + (7 × 4)
41:5 - (9 - 7 × 4)
42:5 - (9 - (7 × 4))
43:5 + 7 × 4 - 9
44:(5 + 7 × 4) - 9
45:(5 + (7 × 4)) - 9
46:5 + (7 × 4) - 9
47:5 + (7 × 4 - 9)
48:5 + ((7 × 4) - 9)
49:(5 × (7 - 4)) + 9
50:5 × (7 - 4) + 9
51:9 × 4 -(5 + 7)
52:(9 × 4) - (5 + 7)
53:9 × 4 - 5 - 7
54:(9 × 4) - 5 - 7
55:(9 × 4 - 5) - 7
56:((9 × 4) - 5) - 7
57:9 - (4 - 7) × 5
58:9 - ((4 - 7) × 5)
59:9 × 4 -(7 + 5)
60:(9 × 4) - (7 + 5)
61:9 × 4 - 7 - 5
62:(9 × 4) - 7 - 5
63:(9 × 4 - 7) - 5
64:((9 × 4) - 7) - 5
65:9 - (5 × (4 - 7))
66:9 - 5 ×(4 - 7)
67:9 + (5 × (7 - 4))
68:9 + 5 ×(7 - 4)
69:(9 - 5) × 7 - 4
70:((9 - 5) × 7) - 4
71:9 + (7 - 4) × 5
72:9 + ((7 - 4) × 5)
73:(7 - 4) × 5 + 9
74:((7 - 4) × 5) + 9
75:7 × 4 + 5 - 9
76:(7 × 4) + 5 - 9
77:(7 × 4 + 5) - 9
78:((7 × 4) + 5) - 9
79:7 × 4 +(5 - 9)
80:(7 × 4) + (5 - 9)
81:7 × 4 - 9 + 5
82:(7 × 4) - 9 + 5
83:(7 × 4 - 9) + 5
84:((7 × 4) - 9) + 5
85:7 × 4 -(9 - 5)
86:(7 × 4) - (9 - 5)
87:(7 × (9 - 5)) - 4
88:7 × (9 - 5) - 4