20 加法 11 等于多少？
20 + 11 = 31
20加法11 等于 31
竖式演算
验算
- 用减法验算：31 − 11 = 20
- 用减法验算：31 − 20 = 11
相关题目
20 + 10 = 30
20 + 12 = 32
20 + 13 = 33
20 + 9 = 29
20 + 14 = 34
20 + 8 = 28
20 + 15 = 35
20 + 7 = 27
19 + 11 = 30
21 + 11 = 32
22 + 11 = 33
18 + 11 = 29
23 + 11 = 34
17 + 11 = 28
24 + 11 = 35
16 + 11 = 27
1 + 30 = 31
2 + 29 = 31
3 + 28 = 31
4 + 27 = 31
5 + 26 = 31
6 + 25 = 31
62 + 27 = 89
82 + 3 = 85
62 + 26 = 88
32 + 41 = 73
50 + 27 = 77
43 + 4 = 47
78 - 47 = 31
52 - 21 = 31