徐良犯贱现场版:因式分解(x-y)(x-y)-4(x-y-1)

来源：百度文库 编辑：高校问答 时间：2024/04/27 14:54:15

(x-y)(x-y)-4(x-y-1)
=(x-y)^2-4(x-y)+4
=(x-y-2)^2
要记住完全平方公式!

(x-y)(x-y)-4(x-y-1)
=(x-y)^2 -4(x-y)+4
=(x-y-2)^2

解：(x-y)(x-y)-4(x-y-1)
＝(x-y)^2-4(x-y)+4=(x-y-2)^2

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