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数学七下：不等式3x+a≤0，正整数解为123，怎么求a的取值范围？
数学七下：不等式3x+a≤0，正整数解为123，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133/209
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