分式约分:(y+z-x)/{x^2-(y+z)^2}

分类: 作业答案 • 2022-01-09 18:02:57

问题描述：

答

(y+z-x)/{x^2-(y+z)^2}
=(y+z-x)/[(x-y-z)(x+y+z)]
=-(x-y-z)/[(x-y-z)(x+y+z)]
=-1/(x+y+z)