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

题目

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

答案

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)