4 12 12 9 算24点。

4 12 12 9 算24点。

1: 4 × (2 × 9 - 12)

2: 4 × ((2 × 9) - 12)

3: 4 × (2 × (12 - 9))

4: 4 × 2 ×(12 - 9)

5: (4 × 2) × (12 - 9)

6: 4 × (9 × 2 - 12)

7: 4 × ((9 × 2) - 12)

8: (4 × 9 + 12) ÷ 2

9: ((4 × 9) + 12) ÷ 2

10: (4 × (12 - 9)) × 2

11: 4 × (12 - 9) × 2

12: 4 × ((12 - 9) × 2)

13: 2 × (4 × (12 - 9))

14: 2 × 4 ×(12 - 9)

15: (2 × 4) × (12 - 9)

16: 2 × (9 + 12 ÷ 4)

17: 2 × (9 + (12 ÷ 4))

18: (2 × 9 - 12) × 4

19: ((2 × 9) - 12) × 4

20: 2 × (12 ÷ 4 + 9)

21: 2 × ((12 ÷ 4) + 9)

22: (2 × (12 - 9)) × 4

23: 2 × (12 - 9) × 4

24: 2 × ((12 - 9) × 4)

25: (9 × 4 + 12) ÷ 2

26: ((9 × 4) + 12) ÷ 2

27: (9 × 2 - 12) × 4

28: ((9 × 2) - 12) × 4

29: (9 + 12 ÷ 4) × 2

30: (9 + (12 ÷ 4)) × 2

31: (12 + 4 × 9) ÷ 2

32: (12 + (4 × 9)) ÷ 2

33: (12 ÷ 4 + 9) × 2

34: ((12 ÷ 4) + 9) × 2

35: (12 + 9 × 4) ÷ 2

36: (12 + (9 × 4)) ÷ 2

37: (12 - 9) × 4 × 2

38: ((12 - 9) × 4) × 2

39: (12 - 9) × (4 × 2)

40: (12 - 9) × 2 × 4

41: ((12 - 9) × 2) × 4

42: (12 - 9) × (2 × 4)

43: 12 ÷ (9 ÷ 2 - 4)

44: 12 ÷ ((9 ÷ 2) - 4)

12+2等于14、、、然后9+4就是13、、

2x4x（12-9）=24

4x2x(12-9)=24

（12-9）*2*4=24