21 加法 19 等于多少？
21 + 19 = 40
21加法19 等于 40
竖式演算
验算
- 用减法验算：40 − 19 = 21
- 用减法验算：40 − 21 = 19
相关题目
21 + 20 = 41
21 + 18 = 39
21 + 21 = 42
21 + 17 = 38
21 + 22 = 43
21 + 16 = 37
21 + 23 = 44
21 + 15 = 36
20 + 19 = 39
22 + 19 = 41
19 + 19 = 38
23 + 19 = 42
24 + 19 = 43
18 + 19 = 37
25 + 19 = 44
17 + 19 = 36
1 + 39 = 40
2 + 38 = 40
3 + 37 = 40
4 + 36 = 40
5 + 35 = 40
6 + 34 = 40
59 + 23 = 82
72 + 30 = 102
17 + 26 = 43
14 + 28 = 42
89 + 50 = 139
68 + 61 = 129
71 - 31 = 40
62 - 22 = 40