21 加法 17 等于多少？
21 + 17 = 38
21加法17 等于 38
竖式演算
验算
- 用减法验算：38 − 17 = 21
- 用减法验算：38 − 21 = 17
相关题目
21 + 16 = 37
21 + 18 = 39
21 + 15 = 36
21 + 19 = 40
21 + 20 = 41
21 + 14 = 35
21 + 21 = 42
21 + 13 = 34
20 + 17 = 37
22 + 17 = 39
19 + 17 = 36
23 + 17 = 40
24 + 17 = 41
18 + 17 = 35
25 + 17 = 42
17 + 17 = 34
1 + 37 = 38
2 + 36 = 38
3 + 35 = 38
4 + 34 = 38
5 + 33 = 38
6 + 32 = 38
67 + 100 = 167
2 + 31 = 33
31 + 15 = 46
51 + 27 = 78
90 + 100 = 190
23 + 63 = 86
67 - 29 = 38
46 - 8 = 38