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如何分解因式（1+x+x²+x³ )²-x³ ?学霸将1+x+x²看成整体
如何分解因式（1+x+x²+x³ )²-x³ ?学霸将1+x+x²看成整体，再运用完全平方和公式
初中数学竞赛题：因式分解题型大全59/121
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