把-a(x-y)-b(y-x)+c(x-y)分解因式正确的结果是( ) A.(x-y)(-a-b+c) B.(y-x)(a-b-c) C.-(x-y)(a+b-c) D.-(y-x)(a+b-c)
问题描述:
把-a(x-y)-b(y-x)+c(x-y)分解因式正确的结果是( )
A. (x-y)(-a-b+c)
B. (y-x)(a-b-c)
C. -(x-y)(a+b-c)
D. -(y-x)(a+b-c)
答
-a(x-y)-b(y-x)+c(x-y),
=a(y-x)-b(y-x)-c(y-x),
=(y-x)(a-b-c).
故选B.