24点题目：使用数字 1 3 8 9，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67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：1,3,8,9 |
| 1 |
((9 × 8) ÷ 3) ÷ 1 |
| 2 |
((9 ÷ 1) × 8) ÷ 3 |
| 3 |
((9 × 8) ÷ 1) ÷ 3 |
| 4 |
((9 × 8) ÷ 3) × 1 |
| 5 |
((9 × 8) × 1) ÷ 3 |
| 6 |
((9 × 1) × 8) ÷ 3 |
| 7 |
(9 × 8) ÷ (3 ÷ 1) |
| 8 |
(8 × (9 ÷ 3)) × 1 |
| 9 |
(9 × (8 × 1)) ÷ 3 |
| 10 |
(8 × (9 ÷ 3)) ÷ 1 |
| 11 |
(9 × 8) ÷ (3 × 1) |
| 12 |
(8 × 1) × (9 ÷ 3) |
| 13 |
(9 × (8 ÷ 1)) ÷ 3 |
| 14 |
(8 ÷ 1) × (9 ÷ 3) |
| 15 |
8 × ((9 × 1) ÷ 3) |
| 16 |
8 × ((9 ÷ 1) ÷ 3) |
| 17 |
8 × (9 ÷ (3 ÷ 1)) |
| 18 |
8 × (9 ÷ (3 × 1)) |
| 19 |
8 × ((9 ÷ 3) × 1) |
| 20 |
8 × ((9 ÷ 3) ÷ 1) |
| 21 |
(8 ÷ (3 ÷ 9)) × 1 |
| 22 |
(8 ÷ (3 ÷ 9)) ÷ 1 |
| 23 |
(9 ÷ (1 ÷ 8)) ÷ 3 |
| 24 |
(8 ÷ 3) ÷ (1 ÷ 9) |
| 25 |
(9 ÷ 1) ÷ (3 ÷ 8) |
| 26 |
(9 × (8 ÷ 3)) × 1 |
| 27 |
(9 ÷ 1) × (8 ÷ 3) |
| 28 |
(8 ÷ (1 ÷ 9)) ÷ 3 |
| 29 |
(9 ÷ (3 ÷ 8)) ÷ 1 |
| 30 |
(9 × 1) ÷ (3 ÷ 8) |
| 31 |
(9 ÷ (3 ÷ 8)) × 1 |
| 32 |
(8 ÷ 1) ÷ (3 ÷ 9) |
| 33 |
(9 × 8) × (1 ÷ 3) |
| 34 |
(8 × 1) ÷ (3 ÷ 9) |
| 35 |
(9 × 1) × (8 ÷ 3) |
| 36 |
(9 × (8 ÷ 3)) ÷ 1 |
| 37 |
(9 ÷ 3) ÷ (1 ÷ 8) |
| 38 |
9 ÷ (3 ÷ (8 × 1)) |
| 39 |
9 × ((8 ÷ 3) ÷ 1) |
| 40 |
8 ÷ ((3 × 1) ÷ 9) |
| 41 |
9 ÷ ((3 ÷ 8) ÷ 1) |
| 42 |
9 × ((8 ÷ 3) × 1) |
| 43 |
9 ÷ (1 ÷ (8 ÷ 3)) |
| 44 |
9 ÷ ((3 ÷ 1) ÷ 8) |
| 45 |
8 ÷ ((3 ÷ 1) ÷ 9) |
| 46 |
9 ÷ (3 × (1 ÷ 8)) |
| 47 |
9 × (8 ÷ (3 ÷ 1)) |
| 48 |
9 ÷ (3 ÷ (8 ÷ 1)) |
| 49 |
9 ÷ (1 × (3 ÷ 8)) |
| 50 |
1 ÷ ((3 ÷ 9) ÷ 8) |
| 51 |
9 ÷ ((3 × 1) ÷ 8) |
| 52 |
9 × (1 ÷ (3 ÷ 8)) |
| 53 |
9 × (8 × (1 ÷ 3)) |
| 54 |
3 ÷ ((9 ÷ 8) − 1) |
| 55 |
1 ÷ (3 ÷ (9 × 8)) |
| 56 |
8 ÷ (3 ÷ (9 ÷ 1)) |
| 57 |
9 × ((8 × 1) ÷ 3) |
| 58 |
8 ÷ (1 ÷ (9 ÷ 3)) |
| 59 |
9 × (8 ÷ (3 × 1)) |
| 60 |
8 ÷ (3 × (1 ÷ 9)) |
| 61 |
1 ÷ ((3 ÷ 8) ÷ 9) |
| 62 |
8 ÷ (3 ÷ (9 × 1)) |
| 63 |
9 × ((8 ÷ 1) ÷ 3) |
| 64 |
8 ÷ ((3 ÷ 9) ÷ 1) |
| 65 |
8 × (1 ÷ (3 ÷ 9)) |
| 66 |
8 × (9 × (1 ÷ 3)) |
| 67 |
8 ÷ (1 × (3 ÷ 9)) |