问题
填空题
因式分x2-y2-2x+1=______.
答案
x2-y2-2x+1,
=-y2+(x2-2x+1),
=-y2+(x-1)2,
=(x+y-1)(x-y-1).
故答案为:(x+y-1)(x-y-1).
因式分x2-y2-2x+1=______.
x2-y2-2x+1,
=-y2+(x2-2x+1),
=-y2+(x-1)2,
=(x+y-1)(x-y-1).
故答案为:(x+y-1)(x-y-1).