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

分类: 作业答案 • 2021-12-31 12:36:03

问题描述：

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