计算[2x^2-(x+y)(x-y)][(-x-y)(y-x)+2y^2]
问题描述：
计算[2x^2-(x+y)(x-y)][(-x-y)(y-x)+2y^2]
答
[2x^2-(x+y)(x-y)][(-x-y)(y-x)+2y^2]
=（2x²-x²+y²）(x²-y²+2y²)
=(x²+y²)(x²+y²)
=x^4+2x²y²+y^4
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