2、5、7、8如何算24
1个回答

1: (2 × 5 - 7) × 8

2: ((2 × 5) - 7) × 8

3: (5 × 2 - 7) × 8

4: ((5 × 2) - 7) × 8

5: 8 × (2 × 5 - 7)

6: 8 × ((2 × 5) - 7)

7: 8 × (5 × 2 - 7)

8: 8 × ((5 × 2) - 7)