设实数x,y满足x^2+4y^2+2x-4y+2=0,则x+y=?

设实数X,Y满足2X+Y-2>=0,X-2Y+4>=0,3X-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 设实数x,y满足x^2+2xy+4y^2=1,则x+2y最大值 设实数X,Y满足X^2+Y^2=1,则3X+4Y的最大值为多少 设实数x,y满足x^2+4y^2+2x-4y+2=0,则x+y=? 设实数x,y满足方程9x²+4y²-3x+2y=0,则z=3x+2y的最大值 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 已知正实数x，y满足x+2y=4，则1x+1y 设实数x,y满足x^2+4y^2+2x-47+2=0,则x^2y+2x的值等于_________ 设Z=X+Y,其中X,Y满足X+2Y>=0,X-Y 设实数x,y满足不等式组{x+2y-5>0 2x+y-7>0 x>=0 y>=0} ,且x,y为整数,则3x+4y的最小