21 加法 24 等于多少？
21 + 24 = 45
21加法24 等于 45
竖式演算
验算
- 用减法验算：45 − 24 = 21
- 用减法验算：45 − 21 = 24
相关题目
21 + 23 = 44
21 + 25 = 46
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21 + 26 = 47
21 + 21 = 42
21 + 27 = 48
21 + 20 = 41
21 + 28 = 49
20 + 24 = 44
22 + 24 = 46
19 + 24 = 43
23 + 24 = 47
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18 + 24 = 42
25 + 24 = 49
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2 + 43 = 45
3 + 42 = 45
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5 + 40 = 45
6 + 39 = 45
41 + 36 = 77
12 + 82 = 94
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1 + 63 = 64
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88 + 1 = 89
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