化简 (x减y)(x加y)加(x减y)加(x加y)等于

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化简(x减y)(x加y)加(x减y)加(x加y)等于化简(x减y)(x加y)加(x减y)加(x加y)等于化简(x减y)(x加y)加(x减y)加(x加y)等于(x-y)(x+y)+(x-y)(x+y)=

化简 (x减y)(x加y)加(x减y)加(x加y)等于
化简 (x减y)(x加y)加(x减y)加(x加y)等于

化简 (x减y)(x加y)加(x减y)加(x加y)等于
(x-y)(x+y)+(x-y)(x+y)
=2*(x-y)(x+y)
=2(x^2-y^2)
=2x^2-2y^2