31 加法 90 等于多少？
31 + 90 = 121
31加法90 等于 121
竖式演算
验算
- 用减法验算：121 − 90 = 31
- 用减法验算：121 − 31 = 90
相关题目
31 + 89 = 120
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30 + 90 = 120
32 + 90 = 122
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33 + 90 = 123
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