72 加法 9 等于多少？
72 + 9 = 81
72加法9 等于 81
竖式演算
验算
- 用减法验算：81 − 9 = 72
- 用减法验算：81 − 72 = 9
相关题目
72 + 8 = 80
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2 + 79 = 81
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27 × 3 = 81