24点 2 7 7 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 7 7 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 ★☆☆☆☆☆☆☆ 【 最简单入门24点题目 】
序号 题目：2,7,7,12 的解法
1 ((12 × 2) + 7) − 7
2 ((7 + 7) + 12) − 2
3 ((12 + 7) + 7) − 2
4 ((12 + 7) − 7) × 2
5 ((12 − 2) + 7) + 7
6 ((12 + 7) − 2) + 7
7 ((12 × 2) − 7) + 7
8 (7 + (12 − 7)) × 2
9 (12 + (7 − 2)) + 7
10 (12 − (7 − 7)) × 2
11 (7 + 7) + (12 − 2)
12 (12 × 2) + (7 − 7)
13 (12 + 7) + (7 − 2)
14 (12 + (7 − 7)) × 2
15 (12 × 2) − (7 − 7)
16 12 × (7 − (7 − 2))
17 12 × ((7 + 2) − 7)
18 12 + ((7 + 7) − 2)
19 12 + (7 + (7 − 2))
20 12 × (2 − (7 − 7))
21 12 × (2 + (7 − 7))
22 ((7 × 2) × 12) ÷ 7
23 ((12 × 7) ÷ 7) × 2
24 ((12 × 7) × 2) ÷ 7
25 ((12 × 2) × 7) ÷ 7
26 (12 × 2) × (7 ÷ 7)
27 (12 × 2) ÷ (7 ÷ 7)
28 (12 ÷ (7 ÷ 7)) × 2
29 (12 × (7 ÷ 7)) × 2
30 12 × (2 ÷ (7 ÷ 7))
31 12 × (2 × (7 ÷ 7))
32 12 × ((7 × 2) ÷ 7)
33 (7 × 2) × (12 ÷ 7)
34 (7 × 2) ÷ (7 ÷ 12)
35 (7 × (12 ÷ 7)) × 2
36 (12 × 7) × (2 ÷ 7)
37 (7 ÷ (7 ÷ 12)) × 2
38 (12 × 7) ÷ (7 ÷ 2)
39 7 × (12 ÷ (7 ÷ 2))
40 2 ÷ (7 ÷ (12 × 7))
41 12 × (7 × (2 ÷ 7))
42 7 ÷ ((7 ÷ 2) ÷ 12)
43 7 × (2 ÷ (7 ÷ 12))
44 7 ÷ ((7 ÷ 12) ÷ 2)
45 2 ÷ ((7 ÷ 12) ÷ 7)
46 2 ÷ ((7 ÷ 7) ÷ 12)
47 12 × (7 ÷ (7 ÷ 2))
48 7 × (2 × (12 ÷ 7))
49 7 × (12 × (2 ÷ 7))
50 12 ÷ ((7 ÷ 7) ÷ 2)
51 12 ÷ ((7 ÷ 2) ÷ 7)
52 7 ÷ (7 ÷ (12 × 2))
53 12 ÷ (7 ÷ (7 × 2))
54 7 × ((12 × 2) ÷ 7)