化简；(x-y)(x+y)+(x-y)²+(x+y)²

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化简；(x-y)(x+y)+(x-y)²+(x+y)²
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化简；(x-y)(x+y)+(x-y)²+(x+y)²
化简；(x-y)(x+y)+(x-y)²+(x+y)²

化简；(x-y)(x+y)+(x-y)²+(x+y)²
(x-y)(x+y)+(x-y)²+(x+y)²=x²-y²+x²-2xy+y²+x²+2xy+y²=3x²+y²