91 加法 30 等于多少？
91 + 30 = 121
91加法30 等于 121
竖式演算
验算
- 用减法验算：121 − 30 = 91
- 用减法验算：121 − 91 = 30
相关题目
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92 + 30 = 122
90 + 30 = 120
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