Question

用5,7,2,9算24点

3种,明天就要教了!

Answer 1

1: 5 * 7 -(2 + 9)
2: (5 * 7) - (2 + 9)
3: 5 * 7 - 2 - 9
4: (5 * 7) - 2 - 9
5: (5 * 7 - 2) - 9
6: [(5 * 7) - 2] - 9
7: 5 * 7 -(9 + 2)
8: (5 * 7) - (9 + 2)
9: 5 * 7 - 9 - 2
10: (5 * 7) - 9 - 2
11: (5 * 7 - 9) - 2
12: [(5 * 7) - 9] - 2
13: 7 * 5 -(2 + 9)
14: (7 * 5) - (2 + 9)
15: 7 * 5 - 2 - 9
16: (7 * 5) - 2 - 9
17: (7 * 5 - 2) - 9
18: [(7 * 5) - 2] - 9
19: 7 * 5 -(9 + 2)
20: (7 * 5) - (9 + 2)
21: 7 * 5 - 9 - 2
22: (7 * 5) - 9 - 2
23: (7 * 5 - 9) - 2
24: [(7 * 5) - 9] - 2
这个网址会对你有用:
http://www.dffy.com/tool/24.htm
复制到地址栏后即可

Answer 2

5*7-2-9