
求:9(x+1)^2(x-1)^2-6(x^2-1)y+y^2= (分解因式)
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9(x+1)^2(x-1)^2-6(x^2-1)y+y^2
=9(x^2-1)^2-6(x^2-1)y+y^2
=[3(x^2-1)-y]^2
=[3(x+1)(x-1)-y]^2
=9(x^2-1)^2-6(x^2-1)y+y^2
=[3(x^2-1)-y]^2
=[3(x+1)(x-1)-y]^2
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