溫馨提示

熟能生巧，例題：

2, 2, 6, 9的24點答案：

1: 2 × (2 × 9 - 6)

2: 2 × ((2 × 9) - 6)

3: 2 × (6 ÷ 2 + 9)

4: 2 × ((6 ÷ 2) + 9)

5: 2 × (9 × 2 - 6)

6: 2 × ((9 × 2) - 6)

7: 2 × (9 + 6 ÷ 2)

8: 2 × (9 + (6 ÷ 2))

9: (2 × 9 - 6) × 2

10: ((2 × 9) - 6) × 2

11: (6 ÷ 2 + 9) × 2

12: ((6 ÷ 2) + 9) × 2

13: (9 × 2 - 6) × 2

14: ((9 × 2) - 6) × 2

15: (9 + 6 ÷ 2) × 2

16: (9 + (6 ÷ 2)) × 2