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数学7上：怎么化简|a-b|+|a+b|-2|c-a|？根据数轴，化简绝对值
数学7上：怎么化简|a-b|+|a+b|-2|c-a|？根据数轴，化简绝对值
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49/257
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