30 加法 42 等于多少？
30 + 42 = 72
30加法42 等于 72
竖式演算
验算
- 用减法验算：72 − 42 = 30
- 用减法验算：72 − 30 = 42
相关题目
30 + 41 = 71
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30 + 45 = 75
30 + 38 = 68
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29 + 42 = 71
31 + 42 = 73
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2 + 70 = 72
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