[2x-(x+y)(x-y)](yy-xx)
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[2x-(x+y)(x-y)](yy-xx)[2x-(x+y)(x-y)](yy-xx)[2x-(x+y)(x-y)](yy-xx)[2x-(x+y)(x-y)](yy-xx)=(2x-xx+yy)(
[2x-(x+y)(x-y)](yy-xx)
[2x-(x+y)(x-y)](yy-xx)
[2x-(x+y)(x-y)](yy-xx)
[2x-(x+y)(x-y)](yy-xx)
=(2x-xx+yy)(yy-xx)
=2xyy-2xxx-xxyy+xxxx+yyyy-yyxx
=xxxx+yyyy-2xxyy+2xyy-2xxx
x y x+yy x+y xx+y x y
x y x+yy x+y xx+y x y
[2x-(x+y)(x-y)](yy-xx)
(x-y)(x+y)(xx-yy)=?
XX-YY/(X-Y)(X-Y)约分
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求解：X+YY'=X(X^2+Y^2)
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xx+12*12=yy(y-x=2)
xy+yy=10,x/2+y/3=6