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
81 + 34 = 115
70 + 50 = 120
93 + 32 = 125
40 + 80 = 120
90 + 35 = 125
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94 - 73 = 21
83 - 62 = 21