问题描述: (x+2y)(x-2y)-(2y-x)(-2x-y)其中x=8,y=-8 1个回答 分类:综合 2014-11-12 问题解答: 我来补答 (x+2y)(x-2y)-(2y-x)(-2x-y)=(x+2y)(x-2y)+(x-2y)(-2x-y)=(x-2y)[(x+2y)+(-2x-y)]=(x-2y)(-x+y)代入x=8 y=-8=-24*16=-384 展开全文阅读