﹙3/2m-n﹚-2m-n/﹙2m-n﹚²等于

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﹙3/2m-n﹚-2m-n/﹙2m-n﹚²等于
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﹙3/2m-n﹚-2m-n/﹙2m-n﹚²等于
﹙3/2m-n﹚-2m-n/﹙2m-n﹚²等于

﹙3/2m-n﹚-2m-n/﹙2m-n﹚²等于
﹙3/2m-n﹚-2m-n/﹙2m-n﹚²
=3/(2m-n)-1/(2m-n)
=2/(2m-n)