80 加法 7 等于多少？
80 + 7 = 87
80加法7 等于 87
竖式演算
验算
- 用减法验算：87 − 7 = 80
- 用减法验算：87 − 80 = 7
相关题目
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2 + 85 = 87
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89 - 2 = 87
87 × 1 = 87