21 加法 58 等于多少？
21 + 58 = 79
21加法58 等于 79
竖式演算
验算
- 用减法验算：79 − 58 = 21
- 用减法验算：79 − 21 = 58
相关题目
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20 + 58 = 78
22 + 58 = 80
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