设x,y满足3x-y-6≤0,x-y+2≧0,x+y≧0,若目标函数z＝ax+y(a＞0)的最大值为14,则a＝ A.1 B.2 C.23 D.53/9

设Z=X+Y,其中X,Y满足X+2Y>=0,X-Y 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 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 设变量x.y满足条件3x+2y 设实数X,Y满足2X+Y-2>=0,X-2Y+4>=0,3X-Y 设实数x,y满足x-y-2≥0,x+2y-4≥0,2y-3≤0(1)2x+y的最小值为 设实数x,y满足 x>=0 x-2y>=0 x-y-2 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x,y满足约束条件x>=0 x>=y 2x-y 设实数x,y满足方程组①x-y-2=0 ③2y-3 设变量x,y满足x+y 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+1≥0 则z=3x+2y的最大值 设x,y满足约束条件{x-y+5≥0,x+y≥0,x≤3}求z=(x+1)^2-y^2的最大值? 设x,y满足约束条件:x-y+1≥0,x+y-1≥0,x≤3.则z=2x-3y的最小值为? 设实数x、y满足方程2x^2+3y^2=6y,求x+y的最大值