11 加法 9 等于多少？
11 + 9 = 20
11加法9 等于 20
竖式演算
验算
- 用减法验算：20 − 9 = 11
- 用减法验算：20 − 11 = 9
相关题目
11 + 8 = 19
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11 + 6 = 17
11 + 13 = 24
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2 + 18 = 20
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