因式分解xy-y²+x-3y-2

因式分解xy-y²+x-3y-2
因式分解xy-y²+x-3y-2

因式分解xy-y²+x-3y-2
xy-y²+x-3y-2
=(xy+x)-(y²+3y+2)
=x(y+1)-(y+1)(y+2)
=(y+1)(x-y-2)
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xy-y²+x-3y-2
=（xy+x）-(y²+3y+2)
=x(y+1)-(y+1)(y+2)
=(x-y-2)(y+1)

xy-y²+x-3y-2
=y（x-y）+（x-y）-2（y+1)
=（x-y）（y+1)-2（y+1)
=（y+1）（x-y-2)