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初中数学：不等式mx-n＞0的解集是x＜5，求(m+n)x＞n-m的解集？
初中数学：不等式mx-n＞0的解集是x＜5，求(m+n)x＞n-m的解集？
一元一次不等式（组），不等式应用题，中考数学，培优考题13/209
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