Question

5、4、1、9如何算出24点?

Answer 1

1:(5 × (4 - 1)) + 9

2:5 × (4 - 1) + 9

3:(5 × (9 - 4)) - 1

4:5 × (9 - 4) - 1

5:(4 - 1) × 5 + 9

6:((4 - 1) × 5) + 9

7:9 + (5 × (4 - 1))

8:9 + 5 ×(4 - 1)

9:9 - (5 × (1 - 4))

10:9 - 5 ×(1 - 4)

11:(9 - 4) × 5 - 1

12:((9 - 4) × 5) - 1

13:9 + (4 - 1) × 5

14:9 + ((4 - 1) × 5)

15:9 - (1 - 4) × 5

16:9 - ((1 - 4) × 5)