9(x-y)^2-12(x-y)+4 (x^2+y^2)^2-4x^2y^2..没有分得很开,请谅解...

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9(x-y)^2-12(x-y)+4(x^2+y^2)^2-4x^2y^2..没有分得很开,请谅解...9(x-y)^2-12(x-y)+4(x^2+y^2)^2-4x^2y^2..没有分得很开,请谅

9(x-y)^2-12(x-y)+4 (x^2+y^2)^2-4x^2y^2..没有分得很开,请谅解...
9(x-y)^2-12(x-y)+4 (x^2+y^2)^2-4x^2y^2
..没有分得很开,请谅解...

9(x-y)^2-12(x-y)+4 (x^2+y^2)^2-4x^2y^2..没有分得很开,请谅解...
9(x-y)^2-12(x-y)+4
=[3(x-y)+2]²
=(3x-3y+2)²
(x^2+y^2)^2-4x^2y^2
=(x²+y²+2xy)(x²+y²-2xy)
=(x+y)²(x-y)²