设实数x,y满足 x>=0 x-2y>=0 x-y-2

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Z=X+Y,其中X,Y满足X+2Y>=0,X-Y 若实数x,y满足{2x-y>=0, 设实数x,y满足y+x^2=0,0 设x,y满足约束条件x>=0 x>=y 2x-y 设实数X,Y满足条件X大于等于0,X小于等于Y,X+2Y-4小于等于,则Z=X+Y的最大值是 若实数x,y满足不等式组x>=0 ,y>=0,x+2y 已知实数x,y满足不等式组：2x-y=0,x+2y 设实数x,y满足x^2+4y^2+2x-4y+2=0,则x+y=? 设变量X,Y满足约束条件{X-Y+3>=0,X+Y>=0,-2