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