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数学7上：多项式、绝对值培优压轴题，求(bx²+d)-(ax³+cx)的值
数学7上：多项式、绝对值培优压轴题，求(bx²+d)-(ax³+cx)的值
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60/257
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