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因式分解：x²(b-1)+y²(1-b)，为什么互为相反数，也是公因式？
因式分解：x²(b-1)+y²(1-b)，为什么互为相反数，也是公因式？
初中数学，因式分解，常见考题，培优拓展专练175/340
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