xy²+2xy-3x-y²+2y-1因式分解

分类: 作业答案 • 2021-12-19 15:51:39

问题描述：

答

xy²+2xy-3x-y²+2y-1
=x(y²+2y-3)-(y²-2y+1)
=x(y+3)(y-1)-(y-1)²
=（y-1)[x(y+3)-(y-1)]
=(y-1)(xy+3x-y+1)