已知X-Y+2=0,则X-Y___Y-X(填不等号)
已知x*x+4x+y*y-2y+5=0,则x*x+y*y=?
已知:x²y²-2x+6y+10=0则x+y=
已知x²+4x+y²-2y+5=0,则x+y=
已知(x+y)(x+y+2)-8=0,则x+y的值是?
已知x-y-3绝对值+(2x+2y+10)的平方=0,则(x+y)(x-Y)=
已知x,y满足约束条件:x-y+1>=0,x+y-2>=0,x
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x满足x^2+2xy+y^2-(x+y)-6=0则x+y的值
已知x²+y²-6x+4y+13=0,则x的y次方的值?已知4x²+2y²-4x
已知实数x,y 满足x2+y2+2x=0则x+y得最小值
已知x-3y=0,求(2x+y)/(x^2-2xy+y^2)X(x-y)
已知x-y/x=x/x-2y(y不等于0),求x:y的值