x的2次方-2xy+y的2次方-2x+2y+1=?

问题描述:

x的2次方-2xy+y的2次方-2x+2y+1=?

x²-2xy+y²-2x+2y+1
=(x-y)²-2(x-y)+1
=(x-y)*(x-y-2)-1分解因式该咋办