因式分解(x-y)^2-4x^2=

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因式分解(x-y)^2-4x^2=因式分解(x-y)^2-4x^2=因式分解(x-y)^2-4x^2==(x-y)²-(2x)²=(x-y-2x)(x-y+2x)=(-x-y)(3

因式分解(x-y)^2-4x^2=
因式分解(x-y)^2-4x^2=

因式分解(x-y)^2-4x^2=
=(x-y)²-(2x)²
=(x-y-2x)(x-y+2x)
=(-x-y)(3x-y)