31 加法 50 等于多少？
31 + 50 = 81
31加法50 等于 81
竖式演算
验算
- 用减法验算：81 − 50 = 31
- 用减法验算：81 − 31 = 50
相关题目
31 + 49 = 80
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30 + 50 = 80
32 + 50 = 82
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