计算:(x^2+y^2)^2-4x^2y^2
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计算:(x^2+y^2)^2-4x^2y^2计算:(x^2+y^2)^2-4x^2y^2计算:(x^2+y^2)^2-4x^2y^2(x^2+y^2)^2-4x^2y^2=x^4+2x^2y^2+y^
计算:(x^2+y^2)^2-4x^2y^2
计算:(x^2+y^2)^2-4x^2y^2
计算:(x^2+y^2)^2-4x^2y^2
(x^2+y^2)^2-4x^2y^2
=x^4+2x^2y^2+y^4-4x^2y^2
=x^4-2x^2y^2+y^4
=(x^2-y^2)^2
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