Question

算24点 1,5,8,9每个数只用一次怎么算?

Answer 1

1,5,8,9的24点答案：
1:(1 - 9) × (5 - 8)
2:(5 - 8) × (1 - 9)
3:(8 - 5) × (9 - 1)
4:8 × (9 - (1 + 5))
5:8 × (9 - 1 - 5)
6:8 × ((9 - 1) - 5)
7:8 × (9 - (5 + 1))
8-18种算式