x^2-4xy+4y^2-2x+4y?
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x^2-4xy+4y^2-2x+4y=(x-2y)^2-2(x-2y)=(x-2y)(x-2y-2),4,原式=(x-2y)^2-2(x-2y)
=(x-2y)(x-2y-2),2,x^2-2x-4xy+4y^2+4y
=(x²-4xy+4y²)-(2x-4y)
=(x-2y)²-2(x-2y)
=(x-2y-2)(x-2y),2,x^2-4xy+4y^2-2x+4y
=(x^2-4xy+4y^2)-2(x-2y)
=(x-2y)²-2(x-2y)
=(x-2y)(x-2y-2),0,x^2-4xy+4y^2-2x+4y
因式分解
=(x-2y)(x-2y-2),2,x^2-2x-4xy+4y^2+4y
=(x²-4xy+4y²)-(2x-4y)
=(x-2y)²-2(x-2y)
=(x-2y-2)(x-2y),2,x^2-4xy+4y^2-2x+4y
=(x^2-4xy+4y^2)-2(x-2y)
=(x-2y)²-2(x-2y)
=(x-2y)(x-2y-2),0,x^2-4xy+4y^2-2x+4y
因式分解
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