81 加法 6 等于多少？
81 + 6 = 87
81加法6 等于 87
竖式演算
验算
- 用减法验算：87 − 6 = 81
- 用减法验算：87 − 81 = 6
相关题目
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82 + 6 = 88
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2 + 85 = 87
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