39 加法 3 等于多少？
39 + 3 = 42
39加法3 等于 42
竖式演算
验算
- 用减法验算：42 − 3 = 39
- 用减法验算：42 − 39 = 3
相关题目
39 + 2 = 41
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39 + 6 = 45
39 + 7 = 46
39 + 8 = 47
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40 + 3 = 43
37 + 3 = 40
41 + 3 = 44
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