24点 2 9 9 12 解题详情
24点在线计算 · 全部题目与解法
24点题目：使用数字 2 9 9 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 48 个解（使用交换律变换后算一个解），难度系数 ★☆☆☆☆☆☆☆ 【 最简单入门24点题目 】
本题共有 48 个解（使用交换律变换后算一个解），难度系数 ★☆☆☆☆☆☆☆ 【 最简单入门24点题目 】
| 序号 | 题目：2,9,9,12 的解法 | |
|---|---|---|
| 1 | ((12 + 9) − 9) × 2 | |
| 2 | ((12 × 2) + 9) − 9 | |
| 3 | ((9 + 9) × 2) − 12 | |
| 4 | ((12 × 2) − 9) + 9 | |
| 5 | (9 + (12 − 9)) × 2 | |
| 6 | (12 × 2) − (9 − 9) | |
| 7 | (12 + (9 − 9)) × 2 | |
| 8 | (12 × 2) + (9 − 9) | |
| 9 | (12 − (9 − 9)) × 2 | |
| 10 | 12 × (2 − (9 − 9)) | |
| 11 | 12 × (2 + (9 − 9)) | |
| 12 | 12 × ((9 + 2) − 9) | |
| 13 | 12 × (9 − (9 − 2)) | |
| 14 | ((12 × 2) × 9) ÷ 9 | |
| 15 | ((9 × 2) × 12) ÷ 9 | |
| 16 | ((12 × 9) ÷ 9) × 2 | |
| 17 | ((12 × 9) × 2) ÷ 9 | |
| 18 | (12 × 2) ÷ (9 ÷ 9) | |
| 19 | (12 × (9 ÷ 9)) × 2 | |
| 20 | (9 + (12 ÷ 2)) + 9 | |
| 21 | (12 ÷ (9 ÷ 9)) × 2 | |
| 22 | (12 × 2) × (9 ÷ 9) | |
| 23 | (9 + 9) + (12 ÷ 2) | |
| 24 | 12 × (2 ÷ (9 ÷ 9)) | |
| 25 | 12 × (2 × (9 ÷ 9)) | |
| 26 | 12 × ((9 × 2) ÷ 9) | |
| 27 | (9 ÷ (9 ÷ 12)) × 2 | |
| 28 | (12 × 9) ÷ (9 ÷ 2) | |
| 29 | (9 × 2) × (12 ÷ 9) | |
| 30 | (9 × (12 ÷ 9)) × 2 | |
| 31 | (9 × 2) ÷ (9 ÷ 12) | |
| 32 | (12 × 9) × (2 ÷ 9) | |
| 33 | 12 ÷ (9 ÷ (9 × 2)) | |
| 34 | 9 × (2 ÷ (9 ÷ 12)) | |
| 35 | 12 × (9 ÷ (9 ÷ 2)) | |
| 36 | 9 ÷ ((9 ÷ 12) ÷ 2) | |
| 37 | 12 ÷ ((9 ÷ 2) ÷ 9) | |
| 38 | 2 ÷ ((9 ÷ 9) ÷ 12) | |
| 39 | 9 × (12 × (2 ÷ 9)) | |
| 40 | 9 ÷ ((9 ÷ 2) ÷ 12) | |
| 41 | 2 ÷ ((9 ÷ 12) ÷ 9) | |
| 42 | 12 ÷ ((9 ÷ 9) ÷ 2) | |
| 43 | 9 × (2 × (12 ÷ 9)) | |
| 44 | 12 × (9 × (2 ÷ 9)) | |
| 45 | 9 × ((12 × 2) ÷ 9) | |
| 46 | 9 × (12 ÷ (9 ÷ 2)) | |
| 47 | 2 ÷ (9 ÷ (12 × 9)) | |
| 48 | 9 ÷ (9 ÷ (12 × 2)) | |