5,5,5,1算成答案24
问题描述：
5,5,5,1算成答案24
答
5 × (5 - 1 ÷ 5)
5 × (5 - (1 ÷ 5))
(5 - 1 ÷ 5) × 5
(5 - (1 ÷ 5)) × 5