x2+y2-6x-8y+25=0,求分式4y2-x2/4xy-x2-4y2的值
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x2+y2-6x-8y+25=0,求分式4y2-x2/4xy-x2-4y2的值
![x2+y2-6x-8y+25=0,求分式4y2-x2/4xy-x2-4y2的值](/uploads/image/z/19378549-37-9.jpg?t=x2%2By2-6x-8y%2B25%3D0%2C%E6%B1%82%E5%88%86%E5%BC%8F4y2-x2%2F4xy-x2-4y2%E7%9A%84%E5%80%BC)
x^2+y^2-6x-8y+25=0
(x-3)^2+(y-4)^2=0
x=3,y=4
4y^2-x^2/4xy-x^2-4y^2=-9又3/16
(x-3)^2+(y-4)^2=0
x=3,y=4
4y^2-x^2/4xy-x^2-4y^2=-9又3/16
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