因式分解(x-y)²+y(y-x)=(x-y)²-y(x-y)=(x-y-y)(x-y)=(x-2y)(x-y)
原式整理,得(x-y)^2-y(x-y)提取(x-y),得(x-y)【(x-y)-y】即(x-y)(x-2y)
原式=(y-x)²+y(y-x)=(y-x)(y-x+y)=(y-x)(2y-x)
(x-y)²+y(y-x)=(x-y)²-y(x-y)=(x-y)[(x-y)-y]=(x-y)(x-2y)