负2,4,5,7的怎样组成24点

问题描述:

负2,4,5,7的怎样组成24点

-2,4,5,7的24点答案:
1 (4 - 2) × (5 + 7)
2 (4 - 2) × (7 + 5)
3 (7 + 5) × (4 - 2)