x,y满足条件y-1≥0,x+y-4≤0,y-1≤k(x-1),k∈R,k

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 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 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 x,y满足条件y-1≥0,x+y-4≤0,y-1≤k(x-1),k∈R,k 变量X,Y满足条件x+y-1≤0 x-y≤0 x≥0 则2x-y的最大值为 已知实数x,y满足条件{2x-y+1≥0,2x+y≥0,x≤1,求z=x+3y的最小值. y满足条件【x-y 若x.y满足条件2x+y-12=0,x-4y+10 不等式.设x,y满足条件x-4y≤-3 3x+5y≤25 x≥1 1：满足条件：3x+4y=12 (0 当x,y满足条件x>=0,y 实数x,y满足条件x+y-4≤0,x-2y+2≥0,x≥0,y≥0,则log4(x/2+y+1)的最大值为 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X,Y满足条件x-y+2>=0,x+y-4>=0,2x-y-5 如果实数x,y满足条件x-y+1≥0,y+1≥0,x+y+1≤0,那么4^x·(1/2)^y的最大值为 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? 如果实数x,y满足条件 x+y≥0 x-y+3≥0 0≤x≤3 那么2x-y的最大值为 如果实数x,y满足条件x-y+1>=0,y+1>=0,x+y+1