2227，2229算24点

2, 2, 2, 7的24点答案：

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

2, 2, 2, 9的24点答案：

1: 2 + (2 × (2 + 9))
2: 2 + 2 ×(2 + 9)
3: 2 + (2 + 9) × 2
4: 2 + ((2 + 9) × 2)
5: 2 + (2 × (9 + 2))
6: 2 + 2 ×(9 + 2)
7: (2 × (2 + 9)) + 2
8: 2 × (2 + 9) + 2
9: 2 + (9 + 2) × 2
10: 2 + ((9 + 2) × 2)
11: (2 + 9) × 2 + 2
12: ((2 + 9) × 2) + 2
13: (2 × (9 + 2)) + 2
14: 2 × (9 + 2) + 2
15: (9 + 2) × 2 + 2
16: ((9 + 2) × 2) + 2

2, 2, 2, 7的24点答案：

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

2, 2, 2, 9的24点答案：

1: 2 + (2 × (2 + 9))
2: