化简：（2x-y)²-4(x-y)(x+y)

化简：（2x-y)²-4(x-y)(x+y)
化简：（2x-y)²-4(x-y)(x+y)

化简：（2x-y)²-4(x-y)(x+y)
(2x-y)²-4(x-y)(x+y)
=(4x²-4xy+y²)-4(x²-y²)
=4x²-4xy+y²-4x²+4y²
=5y²-4xy
=y(5y-4x)
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（2x-y)²-4(x-y)(x+y)
=4x^2-4xy+y^2-4x^2+4y^2
=5y^2-4xy

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