89 加法 20 等于多少？
89 + 20 = 109
89加法20 等于 109
竖式演算
验算
- 用减法验算：109 − 20 = 89
- 用减法验算：109 − 89 = 20
相关题目
89 + 19 = 108
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89 + 24 = 113
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90 + 20 = 110
87 + 20 = 107
91 + 20 = 111
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10 + 99 = 109
11 + 98 = 109
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57 + 28 = 85
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60 + 37 = 97
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