因式分解:9x^2-1-6xy+y^2

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因式分解:9x^2-1-6xy+y^2
因式分解:9x^2-1-6xy+y^2

因式分解:9x^2-1-6xy+y^2
答:
9x^2-1-6xy+y^2
=(3x)^2-2*3xy+y^2-1^2
=(3x-y)^2-1^2
=(3x-y-1)(3x-y+1)

=(3x)²-2×3x×y+y²
=(3x-y)²

原式
=(3x)^2-2*3xy+y^2-1^2
=(3x-y)^2-1
=(3x-y-1)(3x-y+1)

=(9x2-6xy+y2)-1
=(3x-y)2-1
=(3x-y-1)(3x-y+1)