Question

数学因式分解一道题(x-y-z)(x+y-z)-(y-z-x)(y+z-x)

Answer 1

(x-y-z)(x+y-z)-(y-z-x)(y+z-x)

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

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

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

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