4477算24点

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4477算24点

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

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