X²+xy²-x²-y²-3xy+2x+2y-1分解因式
问题描述：
X²+xy²-x²-y²-3xy+2x+2y-1分解因式
答
题目出错了么?是不是 x²y+xy²-x²-y²-3xy+2x+2y-1?x²y+xy²-x²-y²-3xy+2x+2y-1=(x²y+xy²-xy)-(x²+y²+2xy-2x-2y+1=xy(x+y-1)-[(x+y)²-2(x+y)+1]=xy(...