31 加法 53 等于多少？
31 + 53 = 84
31加法53 等于 84
竖式演算
验算
- 用减法验算：84 − 53 = 31
- 用减法验算：84 − 31 = 53
相关题目
31 + 52 = 83
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30 + 53 = 83
32 + 53 = 85
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