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
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2 + 36 = 38
3 + 35 = 38
4 + 34 = 38
5 + 33 = 38
6 + 32 = 38
23 + 23 = 46
65 + 32 = 97
1 + 73 = 74
1 + 91 = 92
91 + 100 = 191
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94 - 56 = 38