3 加法 1 等于多少？
3 + 1 = 4
3加法1 等于 4
竖式演算
验算
- 用减法验算：4 − 1 = 3
- 用减法验算：4 − 3 = 1
相关题目
3 + 2 = 5
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3 + 7 = 10
3 + 8 = 11
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