3 加法 18 等于多少？
3 + 18 = 21
3加法18 等于 21
竖式演算
验算
- 用减法验算：21 − 18 = 3
- 用减法验算：21 − 3 = 18
相关题目
3 + 17 = 20
3 + 19 = 22
3 + 20 = 23
3 + 16 = 19
3 + 21 = 24
3 + 15 = 18
3 + 22 = 25
3 + 14 = 17
2 + 18 = 20
4 + 18 = 22
1 + 18 = 19
5 + 18 = 23
6 + 18 = 24
7 + 18 = 25
8 + 18 = 26
9 + 18 = 27
1 + 20 = 21
2 + 19 = 21
4 + 17 = 21
5 + 16 = 21
6 + 15 = 21
7 + 14 = 21
24 + 47 = 71
73 + 63 = 136
65 + 42 = 107
35 + 74 = 109
81 + 47 = 128
72 + 19 = 91
29 - 8 = 21
39 - 18 = 21