24点题目：使用数字 4 8 9 12，利用加减乘除、括号算出24。数字顺序可以任意调换，下面列出所有可行算式。
本题共有35个解（使用交换律变换后算一个解）,
难度系数是3星
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中等偏易24点题目
】。
| 序号 |
题目：4,8,9,12 |
| 1 |
(9 × 8) − (12 × 4) |
| 2 |
(9 × (8 − 4)) − 12 |
| 3 |
((9 × 8) × 4) ÷ 12 |
| 4 |
((9 × 8) ÷ 12) × 4 |
| 5 |
((9 × 4) × 8) ÷ 12 |
| 6 |
((8 × 4) × 9) ÷ 12 |
| 7 |
(9 × 8) ÷ (12 ÷ 4) |
| 8 |
8 × (9 ÷ (12 ÷ 4)) |
| 9 |
8 × ((9 × 4) ÷ 12) |
| 10 |
(9 ÷ (12 ÷ 8)) × 4 |
| 11 |
(8 × (9 ÷ 12)) × 4 |
| 12 |
(8 × 4) × (9 ÷ 12) |
| 13 |
(9 × 4) × (8 ÷ 12) |
| 14 |
(9 × 4) ÷ (12 ÷ 8) |
| 15 |
(9 × 8) × (4 ÷ 12) |
| 16 |
(8 × 4) ÷ (12 ÷ 9) |
| 17 |
(9 × (8 ÷ 12)) × 4 |
| 18 |
(8 ÷ (12 ÷ 9)) × 4 |
| 19 |
9 × (4 × (8 ÷ 12)) |
| 20 |
8 ÷ (12 ÷ (9 × 4)) |
| 21 |
9 × ((8 × 4) ÷ 12) |
| 22 |
9 ÷ (12 ÷ (8 × 4)) |
| 23 |
8 ÷ ((12 ÷ 4) ÷ 9) |
| 24 |
9 ÷ ((12 ÷ 8) ÷ 4) |
| 25 |
9 × (8 × (4 ÷ 12)) |
| 26 |
8 × (4 × (9 ÷ 12)) |
| 27 |
4 ÷ ((12 ÷ 9) ÷ 8) |
| 28 |
9 × (4 ÷ (12 ÷ 8)) |
| 29 |
9 × (8 ÷ (12 ÷ 4)) |
| 30 |
4 ÷ ((12 ÷ 8) ÷ 9) |
| 31 |
9 ÷ ((12 ÷ 4) ÷ 8) |
| 32 |
4 ÷ (12 ÷ (9 × 8)) |
| 33 |
8 × (4 ÷ (12 ÷ 9)) |
| 34 |
8 ÷ ((12 ÷ 9) ÷ 4) |
| 35 |
8 × (9 × (4 ÷ 12)) |