x^2+y^2-4x-4y-10=0 如何把这个一般方程转化为标准方程

x*x+2x+y*y-4y+5=0 x= y= {4x-3y-10=0 3x-2y=0,{3x-4(x-y)=2 2x-3y=1,{2(x+y)-(x-y)=3 (x+y)-2(x-y)=1 已知x*x-4xy+4y*y=0 求[2x(x+y)-y(x+y)]/(4x*x-4xy+y*y)的值? 若(x*x+y*y)(x*x+y*y)-4x*x*y*y=0,求代数式(x*x+5xy+y*y)/(x*x+2xy+y*y)的值 x^2+4y^2-6x+4y+10=0,求x^4-y^4/(x+2y)(x-2y)*x+2y/xy^2+y^3除以（x^2+y^2/y)^2的值 若(z-x)2-4(x-y)(y-z)=0,求x+z-2y+2009如题 已知x*x+4x+y*y-2y+5=0,则x*x+y*y=? 已知：4x^2+y^2-4x-6y+10=0,求y/x-x/y的值 (x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)= (x+y)(x-y)-(x-y)^2如题 (x+y)(x-y)-(x-y)^2 {2x+y=10 {x-y+z=4 {3x-y-z=0 x²+4y²-2x+12y+10=0求X,Y值 若x.y满足条件2x+y-12=0,x-4y+10 (x-4y)(2x+y)= 计算：(x/x-y)*(y^2/x+y)-(x^4y/x^4-y^4)/x^2/x^2+y^2如题,快,十分钟发 若实数x,y满足（x+2y-2)(3x+2y+2)+2(x2+4)=0,求x+y的值.如题,请详细. 初一数学题求(x+y)(2x-y)-(x+2y)(x-2y)的值,其中x=3,y=4如题 (4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuaihuajian