(x+y)²-4(x+y)(x-y)+4(x-y)²
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(x+y)²-4(x+y)(x-y)+4(x-y)²
(x+y)²-4(x+y)(x-y)+4(x-y)²
(x+y)²-4(x+y)(x-y)+4(x-y)²
原式
=x²+2xy+y²-4(x²-y²)+4(x²-2xy+y²)
=x²+2xy+y²-4x²+4y²+4x²-8xy+4y²
=x²-6xy+9y²
=(x-3y)²
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