39 加法 21 等于多少？
39 + 21 = 60
39加法21 等于 60
竖式演算
验算
- 用减法验算：60 − 21 = 39
- 用减法验算：60 − 39 = 21
相关题目
39 + 20 = 59
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39 + 24 = 63
39 + 18 = 57
39 + 25 = 64
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38 + 21 = 59
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37 + 21 = 58
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2 + 58 = 60
3 + 57 = 60
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52 + 8 = 60
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