24点,11 8 7 4 三种算法

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