分解因式(x-y)²-6(x-y)+9
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/13 13:57:18
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分解因式(x-y)²-6(x-y)+9
分解因式(x-y)²-6(x-y)+9
分解因式(x-y)²-6(x-y)+9
(x-y)²-6(x-y)+9
=[(x-y)-3]²
=(x-y-3)²
原式=(x-y)^2-2*3(x-y)+3^2
((x-y)-3)^2
=[(x-y)-3]^2
=(x-y-3)^2
完全平方公式