因式分解:(x-y)方-4(x方-y方)+4(x+y)方
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因式分解:(x-y)方-4(x方-y方)+4(x+y)方
因式分解:(x-y)方-4(x方-y方)+4(x+y)方
因式分解:(x-y)方-4(x方-y方)+4(x+y)方
(x+y)^2-4(x^2-y^2)+4(x-y)^2
=(x+y)^2-2*2(x+y)(x-y)+4(x-y)^2
=[(x+y)-2(x-y)]^2
=(3y-x)^2
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