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初中数学：不等式的正整数解恰好是1、2、3，怎么求a的取值范围？
初中数学：不等式的正整数解恰好是1、2、3，怎么求a的取值范围？
一元一次不等式（组），不等式应用题，中考数学，培优考题170/209
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