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簡單的就是 提公因式法接着是 運用公式法 (平方差公式 完全平方公式)後來是 十字相乘法①:x^2(a-b)+(b-a)②:x^2y-2xy^2+y^3③:(b-a)^2+2(a-b)+1④:(x^2-y^2)^2-(x^2+y^2)^2⑤:xy^3-6x^2y^2+xy^3⑥:(3a-b)^2-...
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