因式分解:x^2-x-9y^2-3y

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因式分解:x^2-x-9y^2-3y
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因式分解:x^2-x-9y^2-3y
因式分解:x^2-x-9y^2-3y

因式分解:x^2-x-9y^2-3y
此题利用平方差公式得:
x^2-x-9y^2-3y
=(x+3y)(x-3y)-(x+3y)
=(x+3y)(x-3y-1)

2x-2-6y

x^2-x-9y^2-3y
=(x^2-9y^2)-(x+3y)
=(x-3y)*(x+3y)-(x+3y)
=(x-3y-1)*(x+3y)

x^2-x-9y^2-3y
=( x^2-9y^2)-(x+3y)
=(x+3y)(x-3y)-(x+3y)
=(x+3y)(x-3y-1)