若xx+yy-2x-6y+10=0,求分式(xx-yy)/xy的值.

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若xx+yy-2x-6y+10=0,求分式(xx-yy)/xy的值.若xx+yy-2x-6y+10=0,求分式(xx-yy)/xy的值.若xx+yy-2x-6y+10=0,求分式(xx-yy)/xy的

若xx+yy-2x-6y+10=0,求分式(xx-yy)/xy的值.
若xx+yy-2x-6y+10=0,求分式(xx-yy)/xy的值.

若xx+yy-2x-6y+10=0,求分式(xx-yy)/xy的值.
xx+yy-2x-6y+10=0
(x^2-2x+1)+(y^2-6y+9)=0
(x-1)^2+(y-3)^2=0
(x-1)^2=0,(y-3)^2=0
x-1=0,y-3=0
x=1,y=3
(xx-yy)/xy
=(x^2-y^2)/xy
=(1^2-3^2)/1*3
=-8/3

由条件,(x-1)^2+(y-3)^2=0
x=1 y=3
所以所求分式=-8/3