(x+y-z)(x-y+z)-(y+z-x)(z-x-y)公因式过程(x+y-z)(x-y+z)-(y+z-x)(z-x-y)=_数学解答

(x+y-z)(x-y+z)-(y+z-x)(z-x-y)公因式过程(x+y-z)(x-y+z)-(y+z-x)(z-x-y)=(x+y-z)(x-y+z)+(y+z-x)
为什么变成加号只有后面的变号

人气：267 ℃　时间：2020-06-21 07:24:27

解答

(x+y-z)(x-y+z)-(y+z-x)(z-x-y)公因式过程(x+y-z)(x-y+z)-(y+z-x)(z-x-y)=(x+y-z){(x-y+z)+(y+z-x)}(x+y-z)(x-y+z)-(y+z-x)(z-x-y)=(x+y-z)(x-y+z)+(-1)(y+z-x)(z-x-y)=(x+y-z)(x-y+z)+(y+z-x)(-1)(z-x-y)=(x+y-z)(...