分解因式：x-y-xx+2xy-yy+2
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分解因式：x-y-xx+2xy-yy+2分解因式：x-y-xx+2xy-yy+2分解因式：x-y-xx+2xy-yy+2x-y-xx+2xy-yy+2=-(x-y)^2+(x-y)+2=(-x+y+2
分解因式：x-y-xx+2xy-yy+2
分解因式：x-y-xx+2xy-yy+2
分解因式：x-y-xx+2xy-yy+2
x-y-xx+2xy-yy+2
=-(x-y)^2+(x-y)+2
=(-x+y+2)(x-y+1)
x-y-xx+2xy-yy+2
=x-y-(x²-2xy+y²)+2
=-(x-y)²+(x-y)+2
=[(x-y)²-(x-y)-2]
=-(x-y-2)(x-y+1)
x-y-x²+2xy-y²+2
=(x-y)-(x²-2xy+y²)+2
=(x-y)-(x-y)²+2
=(-x+y-1)(x-y-2)
=(y-x-1)(x-y-2)
jjj
(x-y)（1-x+y)+2
原式= -（X²-2XY+Y²）-（Y-X）+2
= -[(Y-X)²+(Y-X)-2]
= -(Y-X+2)(Y-X-1)
分解因式：x-y-xx+2xy-yy+2
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