81 加法 7 等于多少？
81 + 7 = 88
81加法7 等于 88
竖式演算
验算
- 用减法验算：88 − 7 = 81
- 用减法验算：88 − 81 = 7
相关题目
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2 + 86 = 88
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88 × 1 = 88