Question

(x+y+z)^5-(x+y-z)^5-(x+z-y)^5-(z+y-x)^5,

Answer 1

(x+y+z)^5-(x+y-z)^5-(x+z-y)^5-(z+y-x)^5

=80xyz(x^2+y^2+z^2)

注:x^5,y^5,z^5之类的是被消掉了.

我的结果100%是正确的,你再算算吧.朝我的答案方向算一下.