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>=0 x>=y 2x-y 设xy满足约束条件x>=0 y>=0 4x+3y=0 设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X,Y满足约束条件{X-4Y 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+1≥0 则z=3x+2y的最大值 已知x,y满足约束条件：x-y+1>=0,x+y-2>=0,x 已知x,y满足约束条件x-y+5>=0 x+y>=0 X 若变量x,y满足约束条件{x>=-1;y>=x;3x+2y