若x^2+y^2-4x+2y+5=0,求x+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 若2x-3y=0,求5x+4y/3x-2y x*x+y*y-2x+4y+5=0求x, 已知X.x+y.y-4x+2y+5=0,求4X.X-12X Y+9Y.y的值 若x*x+4*y*y+2*x-4*y+2=0,求5*x*x+16*y*y的算术平方跟 若实数x、y满足x平方+y平方-4x-2y+5=0,求根号8y-2x分之（根号x）+y 若实数X,Y满足x²+y²-4x-2y+5=0求√x+y/√8y-2x 若实数x、y满足x*x+y*y-2x+4y+5=0,求x-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? 若x²-4xy+5y²-2y+1=0,求x,y 若x^5+x^4y+x^4+x+y+1=0,且3x+2y=1,求x,y的值 x^2-x+y^2+2y+5/4=0 求x^-1+y^0 已知4x^2+y^2-4x+4y+5=0,求x,y 若x^2+y^2-6x+4y+13=0 求x+y 因式分解 若 x^2+4x+y^2-6y+13=0 求y^x 3x+4y-5=0 x^2+y^2=1求x.y 已知x²+4x+y-2y+5=0求x+2y 已知x²+y²-2x+4y+5=0,求x+y