若x^2+y^2-2x+2y+2=0,则x+y的值是

已知(x+y)(x+y+2)-8=0,则x+y的值是? 已知x*x-4xy+4y*y=0 求[2x(x+y)-y(x+y)]/(4x*x-4xy+y*y)的值? 若|x+y-1|+（x-y-2)²=0,求代数式（x+2y)(x-2y）-（2x-y)(-y-2x)的值. 实数X.Y满足X*X+Y*Y-2X-2Y+1=0,则（Y-4）/（X-2）的取值范围是? 设x>1,y>0,若x^y+x^-y=2根号2,则x^y-x^-y等于 已知1/x-1/y=1/x-y则2y/x+2x/y的值是 已知3x*+xy-2y*=0,求(x/y)-(y/x)-(x*+y*)/(xy)的值.*是平方 已知x-2y/3y-x=2/3,则y/x的值是 若实数X,Y满足X^2+3Y^2-12Y+12=0,则Y的值是? 若实数xy满足（x+y+2)(x+y-1)=0,则x+y的值是 若根号x+y-1+(y+3)^2=0,则x+y的平方根是? 若x-y不等于0,2x-3y=0,则分式(10x-11y)/(x-y)的值是（）?(10x-11y)/(x-y) =[(