2、7、8、11算24点

来源：百度知道 编辑：UC知道 时间：2024/05/27 08:23:00
用加减乘除四种运算符号把2、7、8、11算出得数24（每个数字不得重算或遗漏）有几种算法，都写出来啊··急啊···

1: (2 × 7 - 11) × 8
2: ((2 × 7) - 11) × 8
3: (2 - 8) × (7 - 11)
4: 2 × (8 - 7 + 11)
5: 2 × ((8 - 7) + 11)
6: 2 × (8 - (7 - 11))
7: 2 × (8 + 11 - 7)
8: 2 × ((8 + 11) - 7)
9: 2 × (8 + (11 - 7))
10: 2 × (11 - 7 + 8)
11: 2 × ((11 - 7) + 8)
12: 2 × (11 - (7 - 8))
13: 2 × (11 + 8 - 7)
14: 2 × ((11 + 8) - 7)
15: 2 × (11 + (8 - 7))
16: 7 - 2 + 8 + 11
17: (7 - 2) + 8 + 11
18: (7 - 2 + 8) + 11
19: ((7 - 2) + 8) + 11
20: 7 - 2 +(8 + 11)
21: (7 - 2) + (8 + 11)
22: (7 - (2 - 8)) + 11
23: 7 - (2 - 8) + 11
24: 7 - (2 - (8 + 11))
25: 7 - (2 - 8 - 11)
26: 7 - ((2 - 8) - 11)
27: 7 - 2 + 11 + 8
28: (7 - 2) + 11 + 8
29: (7 - 2 + 11) + 8
30: ((7 - 2) + 11) + 8
31: 7 - 2 +(11 + 8)
32: (7 - 2) + (11 + 8)
33: (7 - (2 - 11)) + 8
34: 7 - (2 - 11) + 8
35: 7 - (2 - (11 + 8))
36: 7 - (2 - 11 - 8)
37