x^2-2y^2-xy-x-y因式分解~

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x^2-2y^2-xy-x-y因式分解~
x^2-2y^2-xy-x-y因式分解~

x^2-2y^2-xy-x-y因式分解~
x²－2y²－xy－x－y
=(x²－y²)－(y²＋xy)－(x＋y)
=(x－y)(x＋y)－y(x＋y)－(x＋y)
=(x＋y)[(x－y)－y－1]
=(x＋y)(x－2y－1)

=（x+y)(x-2y)-(x+y)
=(x+y)(x-2y-1)

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