21 加法 20 等于多少？
21 + 20 = 41
21加法20 等于 41
竖式演算
验算
- 用减法验算：41 − 20 = 21
- 用减法验算：41 − 21 = 20
相关题目
21 + 19 = 40
21 + 21 = 42
21 + 22 = 43
21 + 18 = 39
21 + 23 = 44
21 + 17 = 38
21 + 24 = 45
21 + 16 = 37
20 + 20 = 40
22 + 20 = 42
19 + 20 = 39
23 + 20 = 43
24 + 20 = 44
18 + 20 = 38
25 + 20 = 45
17 + 20 = 37
1 + 40 = 41
2 + 39 = 41
3 + 38 = 41
4 + 37 = 41
5 + 36 = 41
6 + 35 = 41
21 + 66 = 87
24 + 22 = 46
66 + 20 = 86
44 + 51 = 95
28 + 11 = 39
44 + 20 = 64
41 × 1 = 41
59 - 18 = 41