7,2,-5,-13 如何算出24点

7,2,-5,-13 如何算出24点
7,2,-5,-13 如何算出24点

7,2,-5,-13 如何算出24点
(-5+7)*(-13)-2=24

上面的不对，没有5。
2-13-（-5*7）＝24

: 2 - 13 + (-5)×(- 7)
2: (2 - 13) + (-5)×(- 7)
3: 2 - 13 +(-5)×(- 7)
4: (2 - 13) + (-5)×(- 7)
5: 2 - (13 - (-5)×(- 7)
7: 2 × 13 + 5 - 7
8: (2 × 13) + 5 - 7
9: (2 × ...

全部展开

: 2 - 13 + (-5)×(- 7)
2: (2 - 13) + (-5)×(- 7)
3: 2 - 13 +(-5)×(- 7)
4: (2 - 13) + (-5)×(- 7)
5: 2 - (13 - (-5)×(- 7)
7: 2 × 13 + 5 - 7
8: (2 × 13) + 5 - 7
9: (2 × 13 + 5) - 7
10: ((2 × 13) + 5) - 7
11: 2 × 13 +(5 - 7)
12: (2 × 13) + (5 - 7)
13: 2 - 13 + 7 × 5
14: (2 - 13) + 7 × 5
15: 2 - 13 +(7 × 5)
16: (2 - 13) + (7 × 5)
17: 2 - (13 - 7 × 5)
18: 2 - (13 - (7 × 5))
19: 2 × 13 - 7 + 5
20: (2 × 13) - 7 + 5
21: (2 × 13 - 7) + 5
22: ((2 × 13) - 7) + 5
23: 2 × 13 -(7 - 5)
24: (2 × 13) - (7 - 5)
25: 2 + 5 × 7 - 13
26: (2 + 5 × 7) - 13
27: (2 + (5 × 7)) - 13
28: 2 + (5 × 7) - 13
29: 2 + (5 × 7 - 13)
30: 2 + ((5 × 7) - 13)
31: 2 + 7 × 5 - 13
32: (2 + 7 × 5) - 13
33: (2 + (7 × 5)) - 13
34: 2 + (7 × 5) - 13
35: 2 + (7 × 5 - 13)
36: 2 + ((7 × 5) - 13)
37: 13 × 2 + 5 - 7
38: (13 × 2) + 5 - 7
39: (13 × 2 + 5) - 7
40: ((13 × 2) + 5) - 7
41: 13 × 2 +(5 - 7)
42: (13 × 2) + (5 - 7)
43: 13 × 2 - 7 + 5
44: (13 × 2) - 7 + 5
45: (13 × 2 - 7) + 5
46: ((13 × 2) - 7) + 5
47: 13 × 2 -(7 - 5)
48: (13 × 2) - (7 - 5)
49: (13 + 5 × 7) ÷ 2
50: (13 + (5 × 7)) ÷ 2
51: (13 + 7 × 5) ÷ 2
52: (13 + (7 × 5)) ÷ 2
53: (13 × (7 - 5)) - 2
54: 13 × (7 - 5) - 2
55: 5 + 2 × 13 - 7
56: (5 + 2 × 13) - 7
57: (5 + (2 × 13)) - 7
58: 5 + (2 × 13) - 7
59: 5 + (2 × 13 - 7)
60: 5 + ((2 × 13) - 7)
61: 5 + 13 × 2 - 7
62: (5 + 13 × 2) - 7
63: (5 + (13 × 2)) - 7
64: 5 + (13 × 2) - 7
65: 5 + (13 × 2 - 7)
66: 5 + ((13 × 2) - 7)
67: 5 - 7 + 2 × 13
68: (5 - 7) + 2 × 13
69: 5 - 7 +(2 × 13)
70: (5 - 7) + (2 × 13)
71: 5 - (7 - 2 × 13)
72: 5 - (7 - (2 × 13))
73: 5 × 7 + 2 - 13
74: (5 × 7) + 2 - 13
75: (5 × 7 + 2) - 13
76: ((5 × 7) + 2) - 13
77: 5 × 7 +(2 - 13)
78: (5 × 7) + (2 - 13)
79: 5 - 7 + 13 × 2
80: (5 - 7) + 13 × 2
81: 5 - 7 +(13 × 2)
82: (5 - 7) + (13 × 2)
83: 5 - (7 - 13 × 2)
84: 5 - (7 - (13 × 2))
85: (5 × 7 + 13) ÷ 2
86: ((5 × 7) + 13) ÷ 2
87: 5 × 7 - 13 + 2
88: (5 × 7) - 13 + 2
89: (5 × 7 - 13) + 2
90: ((5 × 7) - 13) + 2
91: 5 × 7 -(13 - 2)
92: (5 × 7) - (13 - 2)
93: 7 × 5 + 2 - 13
94: (7 × 5) + 2 - 13
95: (7 × 5 + 2) - 13
96: ((7 × 5) + 2) - 13
97: 7 × 5 +(2 - 13)
98: (7 × 5) + (2 - 13)
99: (7 - 5) × 13 - 2
100: ((7 - 5) × 13) - 2
101: (7 × 5 + 13) ÷ 2
102: ((7 × 5) + 13) ÷ 2
103: 7 × 5 - 13 + 2
104: (7 × 5) - 13 + 2
105: (7 × 5 - 13) + 2
106: ((7 × 5) - 13) + 2
107: 7 × 5 -(13 - 2)
108: (7 × 5) - (13 - 2)
把5*7的 全布换成(-5)×(- 7)

收起

(-5+7)*(-13)-2=24