若变量x y 满足约束条件y=1 x+y=0 x-y-2=0 则z=2x-y的最大值是多少

若变量x,y满足约束条件{x>=-1;y>=x;3x+2y 已知变量x,y满足约束条件1 变量x,y满足约束条件,x+y>=3,x-y>=-1,2x-y 若变量x y满足约束条件{x+y 若变量x,y满足约束条件｛y=0,x-y-2 若变量x,y满足约束条件｛y=0,x-y-2 已知变量x,y满足约束条件x+2y-3=0,y-1 已知变量x,y满足约束条件x+2y-3=0,y-1 设变量x,y满足约束条件x-y>-1,x+y>1,3x-y 已知变量x满足约束条件1：x-y+2=1；3:x+y-7 设变量x,y满足约束条件x-y>=-1,x+y>=1,3x-y 已知变量x,y满足约束条件（x-y+2=1 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 设变量x,y满足约束条件y>=0.x-y+1>=0.x+y-3 若变量x y 满足约束条件y=1 x+y=0 x-y-2=0 则z=2x-y的最大值是多少 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