分解因式：2x²+xy-y²-4x+5y-6我前面会分,后面“-4x+5y-6”就不会啦,

分解因式：2x²+xy-y²-4x+5y-6我前面会分,后面“-4x+5y-6”就不会啦,
分解因式：2x²+xy-y²-4x+5y-6
我前面会分,后面“-4x+5y-6”就不会啦,

分解因式：2x²+xy-y²-4x+5y-6我前面会分,后面“-4x+5y-6”就不会啦,
2x²+xy-y²-4x+5y-6
=(2x-y)(x+y)-4x+5y-6
=(2x-y)(x+y)+2x+2y-6x+3y-6
=(2x-y)(x+y)+2(x+y)-3(2x-y)-6
=［(2x-y)(x+y)+2(x+y)］-［3(2x-y)+6］
=(2x-y+2)(x+y)-3(2x-y+2)
=(2x-y+2)(x+y-3)

-（Y+X-3）（y-2x-2）,你分别取x=1,2,3,在给y来因是分解，在找规律，这是通法