2M-N分之3与4M²-4MN+N²分之2MN 通分要详细点
问题描述：
2M-N分之3与4M²-4MN+N²分之2MN 通分要详细点
答
3/(2M-N)=3(2M-N)/(2M-N)²
2MN/(4M²-4MN+N²)=2MN/(2M-N)²
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