31 加法 70 等于多少？
31 + 70 = 101
31加法70 等于 101
竖式演算
验算
- 用减法验算：101 − 70 = 31
- 用减法验算：101 − 31 = 70
相关题目
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30 + 70 = 100
32 + 70 = 102
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