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数学7上：若a>0，b<0，满足｜x-a｜+｜x-b｜=a-b，求x的取值范围？
数学7上：若a＞0，b＜0，满足|x-a|+|x-b|=a-b，求x的取值范围？
数学7年级上册：相反数，数轴，绝对值化简，培优拓展经典考试题238/257
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