因式分解：x^2-y^2-3x-3y

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因式分解：x^2-y^2-3x-3y
因式分解：x^2-y^2-3x-3y

因式分解：x^2-y^2-3x-3y
=(x+y)(x-y)-3(x+y)
=(x+y)[(x-y)-3]
=(x+y)(x-y-3)

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

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