分解因式：x²-2xy+y²-5x+5y-6
问题描述：
分解因式：x²-2xy+y²-5x+5y-6
答
x²-2xy+y²-5x+5y-6
=(x-y)²-5(x-y)-6
1 -6
1 1
=(x-y-6)(x-y+1)