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三分之二减十二分之七等于多少
更新时间: 2020-09-16 00:00:00  

分母不同时,不能直接相减,需要将两个分数的分母通分成同一个分母,即算出三和十二的最小公倍数是十二,将三分之二通分,即分子分母上下同时乘以四,得出十二分之八,两数分母相同,通分完成,只需要把分子相减,得出答案十二分之一。

关键词: 分之 十二分 等于 多少

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