因式分解x^2+xy-2y^2-x-4y-2

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因式分解x^2+xy-2y^2-x-4y-2
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因式分解x^2+xy-2y^2-x-4y-2
因式分解x^2+xy-2y^2-x-4y-2

因式分解x^2+xy-2y^2-x-4y-2
题目错了
x^2+xy-2y^2+x-4y-2
=(x+2y)(x-y)+(x-4y)-2
=(x+2y+2)(x-y-1)
x^2+xy-2y^2-x+4y-2
=(x+2y)(x-y)-(x-4y)-2
=(x+2y-2)(x-y+1)

(x-y)(x+2y)-(x+2(2y+1))

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