24点题目：使用数字 2 5 5 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54个解（使用交换律变换后算一个解）,
难度系数是1星
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最简单入门24点题目
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| 序号 |
题目：2,5,5,12 |
| 1 |
((12 × 2) + 5) − 5 |
| 2 |
((12 − 5) + 5) × 2 |
| 3 |
((12 + 5) + 2) + 5 |
| 4 |
((12 + 5) + 5) + 2 |
| 5 |
((12 + 5) − 5) × 2 |
| 6 |
((12 × 2) − 5) + 5 |
| 7 |
((12 + 2) + 5) + 5 |
| 8 |
(12 − (5 − 5)) × 2 |
| 9 |
(12 + (5 + 2)) + 5 |
| 10 |
(12 + 5) + (5 + 2) |
| 11 |
(12 × 2) + (5 − 5) |
| 12 |
(12 × 2) − (5 − 5) |
| 13 |
(12 + (5 − 5)) × 2 |
| 14 |
(12 + (5 + 5)) + 2 |
| 15 |
(12 + 2) + (5 + 5) |
| 16 |
12 × (2 − (5 − 5)) |
| 17 |
12 × (2 + (5 − 5)) |
| 18 |
12 + ((5 + 2) + 5) |
| 19 |
12 × (5 − (5 − 2)) |
| 20 |
12 + ((5 + 5) + 2) |
| 21 |
12 × ((5 + 2) − 5) |
| 22 |
((12 × 2) × 5) ÷ 5 |
| 23 |
((12 × 5) ÷ 5) × 2 |
| 24 |
((12 × 5) × 2) ÷ 5 |
| 25 |
(12 × (5 × 2)) ÷ 5 |
| 26 |
(12 × (5 ÷ 5)) × 2 |
| 27 |
(12 × 2) × (5 ÷ 5) |
| 28 |
(12 ÷ (5 ÷ 5)) × 2 |
| 29 |
(12 × 2) ÷ (5 ÷ 5) |
| 30 |
12 × (2 × (5 ÷ 5)) |
| 31 |
12 × (2 ÷ (5 ÷ 5)) |
| 32 |
12 × ((5 × 2) ÷ 5) |
| 33 |
(12 × 5) × (2 ÷ 5) |
| 34 |
(5 × 2) × (12 ÷ 5) |
| 35 |
(5 × (12 ÷ 5)) × 2 |
| 36 |
(5 × 2) ÷ (5 ÷ 12) |
| 37 |
(12 × 5) ÷ (5 ÷ 2) |
| 38 |
(5 ÷ (5 ÷ 12)) × 2 |
| 39 |
12 ÷ ((5 ÷ 2) ÷ 5) |
| 40 |
5 × (12 × (2 ÷ 5)) |
| 41 |
12 × (5 ÷ (5 ÷ 2)) |
| 42 |
2 ÷ ((5 ÷ 12) ÷ 5) |
| 43 |
5 × (12 ÷ (5 ÷ 2)) |
| 44 |
12 × (5 × (2 ÷ 5)) |
| 45 |
2 ÷ (5 ÷ (12 × 5)) |
| 46 |
5 ÷ (5 ÷ (12 × 2)) |
| 47 |
5 ÷ ((5 ÷ 2) ÷ 12) |
| 48 |
5 × ((12 × 2) ÷ 5) |
| 49 |
12 ÷ ((5 ÷ 5) ÷ 2) |
| 50 |
5 ÷ ((5 ÷ 12) ÷ 2) |
| 51 |
5 × ((12 ÷ 5) × 2) |
| 52 |
12 ÷ (5 ÷ (5 × 2)) |
| 53 |
5 × (2 ÷ (5 ÷ 12)) |
| 54 |
2 ÷ ((5 ÷ 5) ÷ 12) |