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数学7上：若abc＜0，a+b+c=0，怎么求式子的值？绝对值培优拓展题
数学7上：若abc＜0，a+b+c=0，怎么求式子的值？绝对值培优拓展题
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188/257
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