20 加法 33 等于多少？
20 + 33 = 53
20加法33 等于 53
竖式演算
验算
- 用减法验算：53 − 33 = 20
- 用减法验算：53 − 20 = 33
相关题目
20 + 32 = 52
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21 + 33 = 54
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