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
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
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