谁能用3 7 8 9加减乘除使结果等于24

1: 3 × (7 - 8 + 9)
2: 3 × ((7 - 8) + 9)
3: 3 × (7 - (8 - 9))
4: 3 × (7 + 9 - 8)
5: 3 × ((7 + 9) - 8)
6: 3 × (7 + (9 - 8))
7: 3 × (9 + 7 - 8)
8: 3 × ((9 + 7) - 8)
9: 3 × (9 + (7 - 8))
10: 3 × (9 - 8 + 7)
11: 3 × ((9 - 8) + 7)
12: 3 × (9 - (8 - 7))
13: (7 - 8 + 9) × 3
14: ((7 - 8) + 9) × 3
15: (7 - (8 - 9)) × 3
16: (7 + 9 - 8) × 3
17: ((7 + 9) - 8) × 3
18: (7 + (9 - 8)) × 3
19: (9 + 7 - 8) × 3
20: ((9 + 7) - 8) × 3
21: (9 + (7 - 8)) × 3
22: (9 - 8 + 7) × 3
23: ((9 - 8) + 7) × 3
24: (9 - (8 - 7)) × 3

3*[（9+7）-8]=24

请输入四个数：3 7 8 9请输入计算值：24满足条件的有：3*(7-8+9)=243*((7-8)+9)=243*(7-(8-9))=243*(7+9-8)=243*((7+9)-8)=243*(7+(9-8))=243*(9+7-8)=243*((9+7)-8)=243*(9+(7-8))=243*(9-8+7)=243*((9-8)+7)=243*(...