(x-y+2)(x+y-2)化简.
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(x-y+2)(x+y-2)化简.(x-y+2)(x+y-2)化简.(x-y+2)(x+y-2)化简.(x-y+2)(x+y-2)=[x-(y-2)][x+(y-2)]=x²-2x(y-2)
(x-y+2)(x+y-2)化简.
(x-y+2)(x+y-2)化简.
(x-y+2)(x+y-2)化简.
(x-y+2)(x+y-2)
=[x-(y-2)][x+(y-2)]
=x²-2x(y-2)+(y-2)²
=x²-2xy+4x+y²-4y+4
原式=[x-(y-2)][x+(y-2)]=x^-(y-2)^=x^-y^+4y-4