设x.y满足x^2/3+y^2/4=1,则x+y的取值范围是

设x,y满足约束条件x+y>=1,x-y>=-1,2x-y 设x,y满足约束条件x+y>=1,x-y>=-1,2x-y 设实数X,Y满足2X+Y-2>=0,X-2Y+4>=0,3X-Y 设正实数x,y满足x^3+y^3=x-y,求证：x^2+4y^2 设实数X,Y满足X^2+Y^2=1,则3X+4Y的最大值为多少 设x.y满足x^2/3+y^2/4=1,则x+y的取值范围是 设x,y满足x^2/4+y^2=1,则k=(x 设变量X,Y满足约束条件{X-Y+3>=0,X+Y>=0,-2 设变量x,y满足约束条件:x-y+3>=0 x+y>=0 -2 设z=2x+y式中变量x,y同时满足x-4y 设变量x.y满足条件3x+2y 设x,y满足约束条件x+y>=1,x-y>=-1,2x-y=7*(a^3b^4)^(1/7) 设Z=X+Y,其中X,Y满足X+2Y>=0,X-Y 设x、y满足{2x+y≥4,x-y≥-1,x-2y≤2,则z=x+y 设实数x,y满足2x+y≤4,x-y≥-1,x-2y≤2,则z=x+y的最大值为 设实数x,y满足x^2+2xy+4y^2=1,则x+2y最大值 设xy满足约束条件 x+y>=1 x-2y>=-2 3x-2y 设实数x,y 满足x²+4y²+2x-4y+2+0 则x+y=