20 加法 90 等于多少？
20 + 90 = 110
20加法90 等于 110
竖式演算
验算
- 用减法验算：110 − 90 = 20
- 用减法验算：110 − 20 = 90
相关题目
20 + 89 = 109
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19 + 90 = 109
21 + 90 = 111
22 + 90 = 112
18 + 90 = 108
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10 + 100 = 110
11 + 99 = 110
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94 + 50 = 144
42 + 92 = 134
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55 × 2 = 110
2 × 55 = 110