已知x2+4x+y2-10y+29=0,求x+2y/x2-2y2的值
已知2x=3y,求xy/(x2+y2)-y2/(x2-y2)的值
已知X2+Y2+8X+6Y+25=0 求代数式X2++XY+4Y2分之X2-4Y2 减X+2Y分之X的值
已知方程x2 +y2+4x-2y-4=0,求x2 +y2的最大值
若X2+Y2-2X-6Y+10=0 ,求(x2-y2)/xy的值
已知x,y为实数,且(x2 +y2)(x2 +y2+2)=3.求x2 +y2的值
已知实数x.y满足(x2+y2)(x2+y2-1)=2,求x2+y2的值
1.已知X2+Y2-4X-6Y+13=0,求Y2-X2的值
已知x2-4x+y2-6y+13=0求x2+y2的值?
已知圆x2+y2-2x-2y+1=0求x2+y2的最大值
已知X2-2x+y2+6y+10=0,求(x2-2xy)/(xy+y2)的值
已知xy满足x2+y2-6x+2y+10=0,求立方根号x2-y2的值
已知x2-2x+y2+6y+10=0,求(2x-y)的值