已知实数x,y满足约束条件x≥0 y≤x 2x+y-9≤0,则z=x+3y有最大值12,则实数a的值为?

已知实数x,y满足约束条件x+y>3,y 已知实数x,y满足约束条件x≥0 y≤x 2x+y-9≤0,则z=x+3y的最大值等于? 已知实数x,y满足约束条件x+y≤1,x≥0,y≥0则z=x-y的最大值是?RT 已知实数x,y满足约束条件y≤x,x+y≤1,y≥-1,则z=2x+y的最大值是多少? 已知实数x,y满足约束条件:x>=2 y>=2 x+y 若实数x,y满足约束条件x-y≥0,x+y≥0,2x+y≤1,则y/(x+1)的最大值是多少, 当实数x,y,满足约束条件{x>0 y>=x 2x+y+k 已知实数想,y满足约束条件y≥1,y≤2x-1,x+y≤5,则z=x-y的最大值等于, 已知实数x,y满足约束条件x≥0 y≤x 2x+y-9≤0,则z=x+3y有最大值12,则实数a的值为? 已知变量x,y满足约束条件1 已知x,y满足约束条件1 实数x,y满足约束条件.求范围实数x,y满足约束条件x-y+2>=0 x+y-4>0x 已知实数x,y满足约束条件x-y+2≥0,2x-y-5≤0,x+y-4≤0,则z=x+2y的最大值是 已知x,y满足约束条件x-y+5>=0 x+y>=0 X 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 已知实数x,y满足约束条件y≥0,x≥-2,x+y≥1,则x2+y2的最小值是 已知实数x,y满足约束条件x+y-6≤0,x+2≥0,x-y-2≥0,则z=2x-y的最小值为