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初中数学：因式分解(b²-b+1)(b²-b+3)+1怎么解？换元法常考题
初中数学：因式分解(b²-b+1)(b²-b+3)+1怎么解？换元法常考题
初中数学，因式分解，常见考题，培优拓展专练260/340
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