设实数x,y满足 x>=0 x-2y>=0 x-y-2

设实数x,y满足 x>=0 x-2y>=0 x-y-2 设实数x,y满足约束条件：x>=2;y>=x;2x+y 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满足方程组①x-y-2=0 ③2y-3 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 设正实数x,y满足x^3+y^3=x-y,求证：x^2+4y^2 设Z=X+Y,其中X,Y满足X+2Y>=0,X-Y 设实数x,y满足0 当实数x,y,满足约束条件{x>0 y>=x 2x+y+k 设实数x、y满足方程2x^2+3y^2=6y,求x+y的最大值