18 加法 3 等于多少？
18 + 3 = 21
18加法3 等于 21
竖式演算
验算
- 用减法验算：21 − 3 = 18
- 用减法验算：21 − 18 = 3
相关题目
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18 + 6 = 24
18 + 7 = 25
18 + 8 = 26
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