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