因式分解:x^2-y^2-3x-5y-4
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因式分解:x^2-y^2-3x-5y-4
因式分解:x^2-y^2-3x-5y-4
因式分解:x^2-y^2-3x-5y-4
(x+y)(x-y)-4x+x-4y-y-4
=(x+y)(x-y)-4(x-y-1)+x-y
=(x+y)(x-y)²-4(x-y-1)
其实这题的-3x=-4x+x,-5y=-4y-y
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因式分解:x^2-y^2-3x-5y-4
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