24点题目：使用数字 2 12 13 13，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45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：2,12,13,13 |
| 1 |
((13 + 12) − 13) × 2 |
| 2 |
((12 × 2) + 13) − 13 |
| 3 |
(12 + (13 − 13)) × 2 |
| 4 |
(12 × 2) + (13 − 13) |
| 5 |
(12 × 2) − (13 − 13) |
| 6 |
(12 − (13 − 13)) × 2 |
| 7 |
(13 − (13 − 12)) × 2 |
| 8 |
12 × (2 − (13 − 13)) |
| 9 |
13 + ((12 × 2) − 13) |
| 10 |
12 × ((13 + 2) − 13) |
| 11 |
12 × (2 + (13 − 13)) |
| 12 |
12 × (13 − (13 − 2)) |
| 13 |
((13 × 2) × 12) ÷ 13 |
| 14 |
((13 × 12) × 2) ÷ 13 |
| 15 |
((13 × 12) ÷ 13) × 2 |
| 16 |
((12 × 2) × 13) ÷ 13 |
| 17 |
(12 ÷ (13 ÷ 13)) × 2 |
| 18 |
(12 × 2) × (13 ÷ 13) |
| 19 |
(12 × 2) ÷ (13 ÷ 13) |
| 20 |
(12 × (13 ÷ 13)) × 2 |
| 21 |
12 × ((13 × 2) ÷ 13) |
| 22 |
12 × (2 × (13 ÷ 13)) |
| 23 |
12 × (2 ÷ (13 ÷ 13)) |
| 24 |
(13 × 12) × (2 ÷ 13) |
| 25 |
(13 × 2) × (12 ÷ 13) |
| 26 |
(13 × (12 ÷ 13)) × 2 |
| 27 |
(13 × 12) ÷ (13 ÷ 2) |
| 28 |
(13 ÷ (13 ÷ 12)) × 2 |
| 29 |
(13 × 2) ÷ (13 ÷ 12) |
| 30 |
12 × (13 ÷ (13 ÷ 2)) |
| 31 |
13 × (12 ÷ (13 ÷ 2)) |
| 32 |
13 ÷ (13 ÷ (12 × 2)) |
| 33 |
13 × (12 × (2 ÷ 13)) |
| 34 |
13 × (2 ÷ (13 ÷ 12)) |
| 35 |
13 × (2 × (12 ÷ 13)) |
| 36 |
12 × (13 × (2 ÷ 13)) |
| 37 |
2 ÷ ((13 ÷ 12) ÷ 13) |
| 38 |
13 ÷ ((13 ÷ 12) ÷ 2) |
| 39 |
12 ÷ (13 ÷ (13 × 2)) |
| 40 |
13 × ((12 × 2) ÷ 13) |
| 41 |
12 ÷ ((13 ÷ 2) ÷ 13) |
| 42 |
2 ÷ ((13 ÷ 13) ÷ 12) |
| 43 |
2 ÷ (13 ÷ (13 × 12)) |
| 44 |
12 ÷ ((13 ÷ 13) ÷ 2) |
| 45 |
13 ÷ ((13 ÷ 2) ÷ 12) |