2 加法 19 等于多少？
2 + 19 = 21
2加法19 等于 21
竖式演算
验算
- 用减法验算：21 − 19 = 2
- 用减法验算：21 − 2 = 19
相关题目
2 + 20 = 22
2 + 18 = 20
2 + 21 = 23
2 + 17 = 19
2 + 22 = 24
2 + 16 = 18
2 + 23 = 25
2 + 15 = 17
1 + 19 = 20
3 + 19 = 22
4 + 19 = 23
5 + 19 = 24
6 + 19 = 25
7 + 19 = 26
8 + 19 = 27
9 + 19 = 28
1 + 20 = 21
3 + 18 = 21
4 + 17 = 21
5 + 16 = 21
6 + 15 = 21
7 + 14 = 21
84 + 84 = 168
53 + 70 = 123
41 + 90 = 131
14 + 94 = 108
38 + 23 = 61
58 + 16 = 74
70 - 49 = 21
98 - 77 = 21