7 7 4 4着4个数字用加减乘除算为24,怎样算

问题描述:

7 7 4 4着4个数字用加减乘除算为24,怎样算

7*(4-4/7)=24

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