分解因式:(x-y)²-2(x-y)+1
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/03 22:12:44
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分解因式:(x-y)²-2(x-y)+1
分解因式:(x-y)²-2(x-y)+1
分解因式:(x-y)²-2(x-y)+1
=[(x-y)-1]²
=(x-y-1)²
x-y)²-2(x-y)+1=(x-y-1)²
解:设(x-y)=t
则有 t²-2t+1 =(t-1)²
将(x-y)代回去
得(x-y-1)²
亲,你要熟记完全平方式子(a+b)²=a²+2ab+b²
(a-b)²=a²-2ab+b²