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