琴书侣铜炉真品图片:因式分解(x-y)(x-y)-4(x-y-1)
来源:百度文库 编辑:中科新闻网 时间:2024/05/23 18:29:40
(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