31 加法 78 等于多少？
31 + 78 = 109
31加法78 等于 109
竖式演算
验算
- 用减法验算：109 − 78 = 31
- 用减法验算：109 − 31 = 78
相关题目
31 + 77 = 108
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30 + 78 = 108
32 + 78 = 110
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