12 加法 12 等于多少？
12 + 12 = 24
12加法12 等于 24
竖式演算
验算
- 用减法验算：24 − 12 = 12
- 用减法验算：24 − 12 = 12
相关题目
12 + 11 = 23
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12 + 9 = 21
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