18 加法 9 等于多少？
18 + 9 = 27
18加法9 等于 27
竖式演算
验算
- 用减法验算：27 − 9 = 18
- 用减法验算：27 − 18 = 9
相关题目
18 + 8 = 26
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18 + 6 = 24
18 + 13 = 31
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