Question

用4、5、9、7算24点

详解

Answer 1

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

Answer 2

4×9-5-7=24

Answer 3

4 × 7 + 5 - 9