21 加法 89 等于多少？
21 + 89 = 110
21加法89 等于 110
竖式演算
验算
- 用减法验算：110 − 89 = 21
- 用减法验算：110 − 21 = 89
相关题目
21 + 88 = 109
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20 + 89 = 109
22 + 89 = 111
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23 + 89 = 112
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5 × 22 = 110
22 × 5 = 110