若实数x,y满足：x-y+1≥0,x+y≥0,x≤0,则z=3的（x+2y）次方的最小值为多少

若实数x,y满足x-y+1》=0,x+y>=0,x 若实数x,y满足x-y+1>=0,x+y>=0,x 若实数x,y满足{x-y+1≥,x>0},则y/(x-1)的取值范围是 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, 若实数x,y满足y 若实数x,y满足不等式y 实数x,y满足{x-y+1>=0;y+1>=0;x+y+1 若实数xy满足x-y+1 若实数x,y是满足1 已知实数x,y满足x-y 已知实数X,Y满足{|x+y| 实数x,y满足:｜x+y｜ 若实数x,y满足x 若实数x,y满足x 若实数X,Y满足{ x-y-1≤0,x+y-3≤0,x≥1,则函数z=2x-y的最大值 若实数x,y满足x-4y+3≤0,3x+5y-25≤0,x≥1,则2x-y的最大值是多少 若实数x,y满足不等式组x>=0 ,y>=0,x+2y 已知实数x,y满足2/x+1/y=1(x,y>0),若不等式x+y≥m恒成立,则m的最大值为