计算 [2x²-(x-y)(x+y)][(2-x)(2+x)+(y-2)(y+2)]_数学解答

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

人气：130 ℃　时间：2020-03-20 03:15:03

解答

[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