问题补充:
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)
答案:
B
解析分析:此题可将x-y的形式化成-(y-x),然后提取公因式(y-x),据此可解此题.
解答:-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.
点评:此题考查的是因式分解,先观察题意找出公因式y-x,然后提取公因式.
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