设X,Y满足条件Y≥0,Y≤X,4X+3y≤12,则（2Y+2）／(X+1)的取值范围是?

不等式.设x,y满足条件x-4y≤-3 3x+5y≤25 x≥1 设变量x.y满足条件3x+2y 设x.y满足条件y>=0.X-Y+1>=0.x+y-3 设X,Y满足条件x-y+2>=0,x+y-4>=0,2x-y-5 设x、y满足条件x-y+5>=0,x+y>=0,x 已知实数x,y满足条件x≥0,y≥x,3x+4y≤12,则(x+2y+3)/(x +1)的最大值是 已知实数x,y满足条件 y≤0,y≥x,2x+y+4≥0,则z=x+3y的最小值是 设X,Y满足条件Y≥0,Y≤X,4X+3y≤12,则（2Y+2）／(X+1)的取值范围是? 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 y满足条件【x-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z=x-y,式中变量x和y满足条件x+y-3≥0,x-2y≥0,则z的最小值为 设z=2y-2x+4,式中x,y满足条件a,0 实数x,y满足条件x+y-4≤0,x-2y+2≥0,x≥0,y≥0,则x-y的最小值为 若x,y满足条件2x-y≥0,2x+3y≤8,y≥0,则z=x+3y的最大值为 设实数X,Y满足2X+Y-2>=0,X-2Y+4>=0,3X-Y 当x,y满足条件|x|+|y|