2x²y²-x的4次方-y的4次方=

分类: 作业答案 • 2023-01-06 03:33:33

问题描述：

2x²y²-x的4次方-y的4次方=

答

2x²y²-x的4次方-y的4次方
=-(x^4+y^4-2x^2y^2)
=-(x^2-y^2)^2
=-(x+y)^2(x-y)^2=-(x^2-y^2)^2=-(x+y)^2(x-y)^2没懂-(x^2-y^2)^2=-[(x+y)(x-y)]^2=-(x+y)^2(x-y)^2