39 加法 8 等于多少？
39 + 8 = 47
39加法8 等于 47
竖式演算
验算
- 用减法验算：47 − 8 = 39
- 用减法验算：47 − 39 = 8
相关题目
39 + 7 = 46
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2 + 45 = 47
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