Question

5.5.5.1四个数字，每个数字只能用一次，加减乘除随便用，怎么算出24

Answer 1

只有一种算法：
5×(5- 1÷5)=24

Answer 2

5*(5-(1/5))
5*(5-(1/5))
(5-(1/5))*5
(5-(1/5))*5
5*(5-(1/5))
5*(5-(1/5))
(5-(1/5))*5
(5-(1/5))*5
5*(5-(1/5))
5*(5-(1/5))
(5-(1/5))*5
(5-(1/5))*5