x^2+y^2-12x+4y+40=0求x,y等于多少,要详细过程,谢谢~

已知X.x+y.y-4x+2y+5=0,求4X.X-12X Y+9Y.y的值 已知x*x-4xy+4y*y=0 求[2x(x+y)-y(x+y)]/(4x*x-4xy+y*y)的值? 求x ,y 9x^2+4y^2-12x-8y+8=0 x²+4y²-2x+12y+10=0求X,Y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*x+y*y-2x+4y+5=0求x, x^2+y^2-12x+4y+40=0求x,y等于多少,要详细过程,谢谢~ 已知x^2+y^2+13-4x+6y=0,求(2x-y)^2-2(2x-y)(x+2y)+(x+2y)^2 已知2x-y/x+3y=2,求代数式4x-2y/x+3y减4x+12y除以2x-y 已知2x-y/x+3y=2,求代数式4x-2y/x+3y减4x+12y/2x-y的值 已知2x-y/x+3y=2,求代数式4x-2y/x+3y减4x+12y/2x-y的值 如果|X|=4 |Y|=2 且|X+Y|=X+Y 求X+Y 求x²+y²-2x+4y+1的最小值 求x,y的值 x²+2xy+4x-12y+22=0 已知x^2+y^2-8x+12y+52=0 ,求1/2x-1/x-y(x-y/2x-x^2+y^2) 已知x^2+y^2-8x+12y+52=0 ,求1/2x-1/x-y(x-y/2x-x^2+y^2) {x+2y+2=0 {7y-4y=-41 求X和Y 已知x.x+y.y+8x+6y+25=0,求代数式(x.x-4y.y)/(x.x+4xy+4y.y)-x/(x+2y)的值 2x-y=2,求[(x²+y²)-(x-y)²+2y(x-y)]÷4y