24点题目：使用数字 1 3 4 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34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
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| 序号 |
题目：1,3,4,12 |
| 1 |
((12 − 4) × 3) × 1 |
| 2 |
((12 × 1) − 4) × 3 |
| 3 |
((12 − 4) × 1) × 3 |
| 4 |
(12 × 1) + (4 × 3) |
| 5 |
(12 + (4 × 3)) × 1 |
| 6 |
(12 − (4 × 1)) × 3 |
| 7 |
(12 − 4) × (3 × 1) |
| 8 |
(4 × 3) + (12 × 1) |
| 9 |
12 × (4 − (3 − 1)) |
| 10 |
12 + ((4 × 1) × 3) |
| 11 |
12 + (4 × (3 × 1)) |
| 12 |
12 × ((4 + 1) − 3) |
| 13 |
12 + ((4 × 3) × 1) |
| 14 |
12 × (1 + (4 − 3)) |
| 15 |
((12 ÷ 1) − 4) × 3 |
| 16 |
((12 − 4) × 3) ÷ 1 |
| 17 |
((12 − 4) ÷ 1) × 3 |
| 18 |
(4 × 3) + (12 ÷ 1) |
| 19 |
(12 + (4 × 3)) ÷ 1 |
| 20 |
(12 × 4) ÷ (3 − 1) |
| 21 |
(12 − 4) × (3 ÷ 1) |
| 22 |
(12 ÷ 1) + (4 × 3) |
| 23 |
(12 − (4 ÷ 1)) × 3 |
| 24 |
(12 ÷ (3 − 1)) × 4 |
| 25 |
12 + ((4 × 3) ÷ 1) |
| 26 |
12 × (4 ÷ (3 − 1)) |
| 27 |
12 + (4 × (3 ÷ 1)) |
| 28 |
12 + ((4 ÷ 1) × 3) |
| 29 |
(12 − 4) ÷ (1 ÷ 3) |
| 30 |
4 ÷ ((3 − 1) ÷ 12) |
| 31 |
3 ÷ (1 ÷ (12 − 4)) |
| 32 |
12 + (3 ÷ (1 ÷ 4)) |
| 33 |
12 + (4 ÷ (1 ÷ 3)) |
| 34 |
12 ÷ ((3 − 1) ÷ 4) |