数学. 设x,y满足约束条件x≦y,x+2y≦3,x≧0,则z=2x-y的最大值为

设X,Y满足约束条件X+Y 设x,y满足约束条件x-4y 设X,Y满足约束条件{X-4Y 数学. 设x,y满足约束条件x≦y,x+2y≦3,x≧0,则z=2x-y的最大值为 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+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 已知实数x,y满足约束条件x+y>3,y 设变量x,y满足约束条件x-y>=-1,x+y>=1,3x-y 满足约束条件(绝对值x)+2(绝对值y) x、y满足的约束条件0