问题标题:
【分解因式:x(x-1)-y(y-1)=______.】
问题描述:
分解因式:x(x-1)-y(y-1)=______.
李厚福回答:
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).
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