x^2-4xy-4x+8y+4y^2+4 因式分解
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x^2-4xy-4x+8y+4y^2+4 因式分解
x^2-4xy-4x+8y+4y^2+4 因式分解
x^2-4xy-4x+8y+4y^2+4 因式分解
x^2-4xy-4x+8y+4y^2+4
=x²-4xy+4y²-4x+8y+4
=(x-2y)²-4(x-2y)+4
=(x-2y-2)²
x^2-4xy-4x+8y+4y^2+4
=x^2-4xy+4y^2-4x+8y+4
=(x-2y)^2-4(x-2y)+4
=(x-2y-2)^2
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