设x,y满足约束条件x+y>=1,x-y>=-1,2x-y=7*(a^3b^4)^(1/7)

设X,Y满足约束条件X+Y 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 设变量x,y满足约束条件x-y>-1,x+y>1,3x-y 设变量x,y满足约束条件x-y>=-1,x+y>=1,3x-y 设x,y满足约束条件x>=0 x>=y 2x-y 设x,y满足约束条件{x>=0,y>=x,4x+3y 设x,y满足约束条件x>=0 y>=x 4x+3y 设实数x,y满足约束条件：x>=2;y>=x;2x+y 设x,y满足约束条件x-4y 设X,Y满足约束条件{X-4Y 设变量x,y满足约束条件y>=0.x-y+1>=0.x+y-3 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x,y满足约束条件x+y>=a,x-y 设变量x y满足约束条件x-y≥-1 x+y≥1 2x-y≤1 z=(x-2y)/(x+y)的最大值 变量x,y满足约束条件,x+y>=3,x-y>=-1,2x-y 设xy满足约束条件 x+y>=1 x-2y>=-2 3x-2y