x²-y²+6x+9分之x²+y²-9-2xy

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x²-y²+6x+9分之x²+y²-9-2xy
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x²-y²+6x+9分之x²+y²-9-2xy
x²-y²+6x+9分之x²+y²-9-2xy

x²-y²+6x+9分之x²+y²-9-2xy
x2-y2+6x+9=(x+3)2-y2=(x+3-y)(x+3+y)
x2+y2-9-2xy=(x+y)2-9=(x+y-3)(x+y+3)
x2-y2+6x+9分之x2+y2-9-2xy
=(x+y-3)/(x+3-y)