39 加法 1 等于多少？
39 + 1 = 40
39加法1 等于 40
竖式演算
验算
- 用减法验算：40 − 1 = 39
- 用减法验算：40 − 39 = 1
相关题目
39 + 2 = 41
39 + 3 = 42
39 + 4 = 43
39 + 5 = 44
39 + 6 = 45
39 + 7 = 46
39 + 8 = 47
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40 + 1 = 41
37 + 1 = 38
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2 + 38 = 40
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