因式分解:9(x-y)²-y²
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因式分解:9(x-y)²-y²
因式分解:9(x-y)²-y²
因式分解:9(x-y)²-y²
原式=[3(x-y)]²-y²
=[3(x-y)+y][3(x-y)-y]
=(3x-2y)(3x-4y)
=[3(x-y)+y][3(x-y)-y]
=(3x-2y)(3x-4y)
希望能帮你忙,不懂请追问,懂了请采纳,谢谢
=(3x-3y+y)(3x-3y-y)
=(3x-2y)(3x-4y)