4 4 7 7=24 怎么算=24?

问题描述:

4 4 7 7=24 怎么算=24?

1:(4 - 4 ÷ 7) × 7
2:(4 - (4 ÷ 7)) × 7
3:7 × (4 - 4 ÷ 7)
4:7 × (4 - (4 ÷ 7))