来自董华明的问题
【(2m-n)ˆ(2m+n)ˆ2(nˆ2+4mˆ2)ˆ2(x+y)ˆ2(x-y)ˆ2-(x-y)(x+y)(xˆ2+yˆ2)】
(2m-n)ˆ(2m+n)ˆ2(nˆ2+4mˆ2)ˆ2
(x+y)ˆ2(x-y)ˆ2-(x-y)(x+y)(xˆ2+yˆ2)
3回答
2020-03-24 13:10