21 加法 70 等于多少?
21 + 70 = 91
21加法70 等于 91
竖式演算
验算
- 用减法验算:91 − 70 = 21
- 用减法验算:91 − 21 = 70
相关题目
21 + 69 = 90
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20 + 70 = 90
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