会玩24点的人快来!!

1: 7 × (3 ÷ 7 + 3)
2: 7 × ((3 ÷ 7) + 3)
3: 7 × (3 + 3 ÷ 7)
4: 7 × (3 + (3 ÷ 7))
5: (3 ÷ 7 + 3) × 7
6: ((3 ÷ 7) + 3) × 7
7: (3 + 3 ÷ 7) × 7
8: (3 + (3 ÷ 7)) × 7

————————————————————————
1: 12 × 3 - 13 + 1
2: (12 × 3) - 13 + 1
3: (12 × 3 - 13) + 1
4: ((12 × 3) - 13) + 1
5: 12 × 3 -(13 - 1)
6: (12 × 3) - (13 - 1)
7: 12 × 3 + 1 - 13
8: (12 × 3) + 1 - 13
9: (12 × 3 + 1) - 13
10: ((12 × 3) + 1) - 13
11: 12 × 3 +(1 - 13)
12: (12 × 3) + (1 - 13)
13: (13 - 1) × 3 - 12
14: ((13 - 1) × 3) - 12
15: 3 × 12 - 13 + 1
16: (3 × 12) - 13 + 1
17: (3 × 12 - 13) + 1
18: ((3 × 12) - 13) + 1
19: 3 × 12 -(13 - 1)
20: (3 × 12) - (13 - 1)
21: 3 × 12 + 1 - 13
22: (3 × 12) + 1 - 13
23: (3 × 12 + 1) - 13
24: ((3 × 12) + 1) - 13
25: 3 × 12 +(1 - 13)
26: (3 × 12) + (1 - 13)
27: (3 × (13 - 1)) - 12