6.7.8.9加减乘除等于24,但是每个数字必须只能用到一次?

8, 9, 6, 7的24点答案：

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

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

6/(9-7)*8=24