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
21 + 90 = 111
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21 + 92 = 113
21 + 86 = 107
21 + 93 = 114
21 + 85 = 106
20 + 89 = 109
22 + 89 = 111
19 + 89 = 108
23 + 89 = 112
24 + 89 = 113
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11 + 99 = 110
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14 + 96 = 110
15 + 95 = 110
62 + 78 = 140
57 + 58 = 115
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11 × 10 = 110
2 × 55 = 110