49 加法 78 等于多少？
49 + 78 = 127
49加法78 等于 127
竖式演算
验算
- 用减法验算：127 − 78 = 49
- 用减法验算：127 − 49 = 78
相关题目
49 + 77 = 126
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50 + 78 = 128
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