Question

怎么能让9 7 5 4得数是24

Answer 1

1:9 + (7 - 4) × 5

2:9 + ((7 - 4) × 5)

3:9 + (5 × (7 - 4))

4:9 + 5 ×(7 - 4)

5:(9 - 5) × 7 - 4

6:((9 - 5) × 7) - 4

7:9 - (5 × (4 - 7))

8:9 - 5 ×(4 - 7)

9:9 - (4 - 7) × 5

10:9 - ((4 - 7) × 5)

11:9 × 4 -(7 + 5)

12:(9 × 4) - (7 + 5)