已知x,y满足x^2+2xy+2y^2-4y+4=0,试求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? 已知实数xy满足x^2+y^2-6x+4y+13=0求x^y的值 已知实数x y满足x×x+y×y-xy+2x-y+1=0 试求x y的值 已知x,y满足x^2+2xy+2y^2-4y+4=0,试求x+y的值 已知xy满足x^2+y^2+4/5=2x+y 求代数式yx/x+y的值 已知实数x、y满足X2+y2-xy+2x-y+1=0,试求x、y的值 已知xy为实数,且满足2x^2+4xy+4y^2+8x+12y+10=0,试求x+y的值 已知实数x、y满足x^2+4xy+4y^2+x+2y-6=0,求6/(x+2y)的值 已知实数x,y满足5x^2-3xy+1\2y^2-2x+1\2y+1\4=0,求x,y的值 已知X,Y为实数,且满足2X^2+4XY+4Y^2+8X+12Y+10=0,求x+y的值. 已知实数x、y满足5x²-3xy+1/2y²-2x+1/2y+1/4=0 求x、y的值 已知x,y满足x^2+y^2-2x-y+5/4=0,求代数式xy(x+y)的值