9 加法 30 等于多少？
9 + 30 = 39
9加法30 等于 39
竖式演算
验算
- 用减法验算：39 − 30 = 9
- 用减法验算：39 − 9 = 30
相关题目
9 + 29 = 38
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9 + 33 = 42
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9 + 34 = 43
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10 + 30 = 40
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2 + 37 = 39
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