问题描述: 一道初一数学题(用平方差公式解)(x-y+z)²-(x+y-z)² 1个回答 分类:数学 2014-11-27 问题解答: 我来补答 (x-y+z)²-(x+y-z)²=[(x-y+z)+(x+y-z)][(x-y+z)-(x+y-z)]=(x-y+z+x+y-z)(x-y+z-x-y+z)=2x × (-2y+2z)=-4xy+4xz=-4x(y-z) 展开全文阅读