证明:(y+z-2x)3+(z+x-2y)3+(x+y-2z)3=3(y+z-2 发布时间:2017-03-29 18:14 │ 来源:www.tikuol.com 题型:解答题 问题: 证明:(y+z-2x)3+(z+x-2y)3+(x+y-2z)3=3(y+z-2x)(z+x-2y)(x+y-2z).