计算 [2x²-(x-y)(x+y)][(2-x)(2+x)+(y-2)(y+2)]
3个回答
[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
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