28 加法 9 等于多少？
28 + 9 = 37
28加法9 等于 37
竖式演算
验算
- 用减法验算：37 − 9 = 28
- 用减法验算：37 − 28 = 9
相关题目
28 + 8 = 36
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28 + 6 = 34
28 + 13 = 41
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29 + 9 = 38
27 + 9 = 36
30 + 9 = 39
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2 + 35 = 37
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