因式分解x^2+xy-2y^2-x+7x-6急阿

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因式分解x^2+xy-2y^2-x+7x-6急阿
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因式分解x^2+xy-2y^2-x+7x-6急阿
因式分解x^2+xy-2y^2-x+7x-6
急阿

因式分解x^2+xy-2y^2-x+7x-6急阿
x^2+xy-2y^2-x+7y-6
=(x+2y)(x-y)-x+7y-6
=(x+2y)(x-y)+2x+4y-3x+3y-6
=(x+2y)(x-y)+2(x+2y)-3(x-y)-6
=(x+2y-3)(x-y+2)

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