4，8，9，2加减乘除如何等于24

8×（9－4－2）＝8×3＝24

1: 8 × (9 - (4 + 2))
2: 8 × (9 - 4 - 2)
3: 8 × ((9 - 4) - 2)
4: 8 × (9 - (2 + 4))
5: 8 × (9 - 2 - 4)
6: 8 × ((9 - 2) - 4)
7: (9 - (4 + 2)) × 8
8: (9 - 4 - 2) × 8
9: ((9 - 4) - 2) × 8
10: (9 - (2 + 4)) × 8
11: (9 - 2 - 4) × 8
12: ((9 - 2) - 4) × 8

8 × (9 - 4 - 2)=24

8*(9-2-4)=24

也只有这种了

（9-4-2）*8