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八年级数学：x³+x²+x+1=0，求x2020的值？看视频，方法怎么样？
八年级数学：x³+x²+x+1=0，求x2020的值？看视频，这方法怎么样？
初中数学，完全平方公式，基础训练，培优专题66/139
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