2 加法 29 等于多少？
2 + 29 = 31
2加法29 等于 31
竖式演算
验算
- 用减法验算：31 − 29 = 2
- 用减法验算：31 − 2 = 29
相关题目
2 + 28 = 30
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3 + 29 = 32
4 + 29 = 33
5 + 29 = 34
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