21 加法 23 等于多少？
21 + 23 = 44
21加法23 等于 44
竖式演算
验算
- 用减法验算：44 − 23 = 21
- 用减法验算：44 − 21 = 23
相关题目
21 + 22 = 43
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22 + 23 = 45
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