31 加法 42 等于多少？
31 + 42 = 73
31加法42 等于 73
竖式演算
验算
- 用减法验算：73 − 42 = 31
- 用减法验算：73 − 31 = 42
相关题目
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30 + 42 = 72
32 + 42 = 74
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