因式分解 :(x+y-z)(x-y-z)+(y-x+z)(y-x-z)

问题描述:

因式分解 :(x+y-z)(x-y-z)+(y-x+z)(y-x-z)

(x+y-z)(x-y-z)+(y-x+z)(y-x-z)
=(x+y-z)(x-y-z)-(x-y-z)(y-x-z)
=(x-y-z)(x+y-z-y+x+z)
=(x-y-z)2x
=2x(x-y-z)