21 加法 71 等于多少？
21 + 71 = 92
21加法71 等于 92
竖式演算
验算
- 用减法验算：92 − 71 = 21
- 用减法验算：92 − 21 = 71
相关题目
21 + 70 = 91
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20 + 71 = 91
22 + 71 = 93
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97 - 5 = 92