设实数x.y满足x^2+y=0(0

设实数x,y满足 x>=0 x-2y>=0 x-y-2 设实数x,y满足方程组①x-y-2=0 ③2y-3 设实数x,y满足0 设实数X,Y满足2X+Y-2>=0,X-2Y+4>=0,3X-Y 设Z=x+y,其中实数x,y满足不等式x+2y>=0,x-y 设z=x+y,其中实数x,y满足{x+2y>=0,x-y 设实数x,y 满足x²+4y²+2x-4y+2+0 则x+y= 设实数x,y满足y+x^2=0,0 设实数x.y满足y+x^2=0,若0 ·设实数x,y满足y+x^2=0,若0 设实数x,y满足y+x^2=0,0 设实数x.y满足x^2+y=0(0 设实数x,y满足y+x^2=0,0 设实数x,y满足约束条件：x>=2;y>=x;2x+y 设实数xy满足X平方+Y平方-2Y=0,则X平方+Y平方的最大值是 设Z=X+Y,其中X,Y满足X+2Y>=0,X-Y 设实数x,y满足x^2+2xy-1=0则x+y的取值范围是 设实数x,y满足x^2+2xy-1=0,则x+y的取值范围是