计算 [2x²-(x-y)(x+y)][(2-x)(2+x)+(y-2)(y+2)]

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计算 [2x²-(x-y)(x+y)][(2-x)(2+x)+(y-2)(y+2)]
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计算 [2x²-(x-y)(x+y)][(2-x)(2+x)+(y-2)(y+2)]
计算 [2x²-(x-y)(x+y)][(2-x)(2+x)+(y-2)(y+2)]

计算 [2x²-(x-y)(x+y)][(2-x)(2+x)+(y-2)(y+2)]
[2x²-(x-y)(x+y)][(2-x)(2+x)+(y-2)(y+2)]
=[2x²-x²+y²][4-x²+y²-4]
=[x²+y²][y²-x²]
=y^4-x^4

=(2x^2-x^2+y^2)(4-x^2+y^2-4)=(x^2+y^2)(y^2-x^2)=y^4-x^4

原式=【2x*x-(x*x-y*y)】【4-x*x+y*y-4】
=(y*y-x*x)(y*y-x*x)
=(y+x)(y+x)(y-x)(y-x)