2 加法 18 等于多少？
2 + 18 = 20
2加法18 等于 20
竖式演算
验算
- 用减法验算：20 − 18 = 2
- 用减法验算：20 − 2 = 18
相关题目
2 + 17 = 19
2 + 19 = 21
2 + 20 = 22
2 + 16 = 18
2 + 21 = 23
2 + 15 = 17
2 + 22 = 24
2 + 14 = 16
1 + 18 = 19
3 + 18 = 21
4 + 18 = 22
5 + 18 = 23
6 + 18 = 24
7 + 18 = 25
8 + 18 = 26
9 + 18 = 27
1 + 19 = 20
3 + 17 = 20
4 + 16 = 20
5 + 15 = 20
6 + 14 = 20
7 + 13 = 20
49 + 90 = 139
45 + 60 = 105
54 + 95 = 149
39 + 52 = 91
7 + 56 = 63
40 + 82 = 122
51 - 31 = 20
69 - 49 = 20