21 加法 5 等于多少？
21 + 5 = 26
21加法5 等于 26
竖式演算
验算
- 用减法验算：26 − 5 = 21
- 用减法验算：26 − 21 = 5
相关题目
21 + 4 = 25
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21 + 8 = 29
21 + 1 = 22
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