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 2x-y≤1 z=(x-2y)/(x+y)的最大值
设X,Y满足约束条件X+Y
设x,y满足约束条件x>=0 x>=y 2x-y
若变量x,y满足约束条件{x>=-1;y>=x;3x+2y
已知x,y满足约束条件:x-y+1>=0,x+y-2>=0,x
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
设变量x,y满足约束条件 {x-y≥0,x+y≤1,x+2y≥0},则函数Z=2x+y 的最大值?
设xy满足约束条件 x+y>=1 x-2y>=-2 3x-2y
设变量X,Y满足约束条件{X-Y+3>=0,X+Y>=0,-2
已知x,y 满足约束条件y>=2|x|,x+y-1
设变量x,y满足约束条件2x+y≤2,x≥y,y≥-1,则z=-y+3x的最大值为?