11 加法 20 等于多少？
11 + 20 = 31
11加法20 等于 31
竖式演算
验算
- 用减法验算：31 − 20 = 11
- 用减法验算：31 − 11 = 20
相关题目
11 + 19 = 30
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11 + 23 = 34
11 + 17 = 28
11 + 24 = 35
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12 + 20 = 32
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9 + 20 = 29
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