设变量x,y满足约束条件｛y≦x；x+y≧2;y≧3x-6,则目标函数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 已知变量x,y满足约束条件1 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 已知变量x,y满足约束条件｛x+y 已知变量x,y满足约束条件｛x+y 若变量x y满足约束条件{x+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y>=0.x-y+1>=0.x+y-3 设变量x,y满足x+y 变量x,y满足约束条件,x+y>=3,x-y>=-1,2x-y 设变量满足约束条件x+y≧3,x-y≧-1,2x-y≦3,则目标函数z=2x+2y最小值 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 设x,y满足约束条件x-4y 设X,Y满足约束条件{X-4Y 若变量x,y满足约束条件{x>=-1;y>=x;3x+2y 设变量x,y满足约束条件y≤x,x+y≥2,y≥3x-6,则目标函数z=2x+y的最小值