3,4,7,8这4个数怎么样算才可以让答案等于24,加减乘除只能用一次,数字也只能用一次

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