2 加法 78 等于多少?
2 + 78 = 80
2加法78 等于 80
竖式演算
验算
- 用减法验算:80 − 78 = 2
- 用减法验算:80 − 2 = 78
相关题目
2 + 77 = 79
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5 + 78 = 83
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5 + 75 = 80
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