因式分解:(x^2+xy+y^2)^2-x^2y^2
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(x^2+xy+y^2)^2-x^2y^2 =[(x^2+xy+y^2)+xy][(x^2+xy+y^2)-xy] =(x^2+2xy+y^2)(x^2+y^2) =(x+y)^2(x^2+y^2)
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