20 加法 57 等于多少？
20 + 57 = 77
20加法57 等于 77
竖式演算
验算
- 用减法验算：77 − 57 = 20
- 用减法验算：77 − 20 = 57
相关题目
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21 + 57 = 78
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2 + 75 = 77
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1 × 77 = 77