牧神的夜宴:因式分解:xy+y^2+x-y-2

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过程`

xy+y^2+x-y-2
=(xy+x)+(y^2-y-2)
=x(y+1)+(y-2)(y+1)
=(y+1)(x+y-2)

xy+y^2+x-y-2
=(x+y-2)(y+1)

原式=x(y+1)+(y^2-y-2)=x(y+1)+(y-2)(y+1)=(y+1)(x+y-2)