求化解【(x+y)^2-4xy】【(x-y)^2+4xy】
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原式=(x²+2xy+y²-4xy)(x²-2xy+y²+4xy)
=(x²-2xy+y²)(x²+2xy+y²)
=(x-y)²(x+y)²
=(x²-y²)²
=x^4-2x²y²+y^4
=(x²-2xy+y²)(x²+2xy+y²)
=(x-y)²(x+y)²
=(x²-y²)²
=x^4-2x²y²+y^4
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解:【(x+y)^2-4xy】【(x-y)^2+4xy】
=(x²+2xy+y²-4xy)(x²-2xy+y²+4xy)
=(x²-2xy+y²)(x²+2xy+y²)
=(x-y)²(x+y)²
=(x²+2xy+y²-4xy)(x²-2xy+y²+4xy)
=(x²-2xy+y²)(x²+2xy+y²)
=(x-y)²(x+y)²
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原式=[x^2+2xy+y^2-4xy][x^2-2xy+y^2+4xy]
=(x^2-2xy+y^2)(x^2+2xy+y^2)
=(x-y)(x-y)(x+y)(x+y)
=(x^2-y^2)^2
=x^4-2x^2y^2+y^4
=(x^2-2xy+y^2)(x^2+2xy+y^2)
=(x-y)(x-y)(x+y)(x+y)
=(x^2-y^2)^2
=x^4-2x^2y^2+y^4
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