31 加法 24 等于多少？
31 + 24 = 55
31加法24 等于 55
竖式演算
验算
- 用减法验算：55 − 24 = 31
- 用减法验算：55 − 31 = 24
相关题目
31 + 23 = 54
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30 + 24 = 54
32 + 24 = 56
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