若实数x,y满足｛x-y≤0,x+y≥0,y-3≤0｝,若不等式a(x^2+y^2)≤（x+y)^2恒成立,则实数a的最大值为

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满足不等式组｛x+y≥2 ｛2x-y≤4 ｛x-y≥0 ,则2x+3y的最小值是? 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满足不等式组y≤2,x-y≥0,x-2y≤0.则z=x+y的最大值为 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{ 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满足不等式组x>=0 ,y>=0,x+2y 若实数x,y满足x^2-xy-y^2 =0,则x/y=? 若实数x,y满足{x-y+1≥,x>0},则y/(x-1)的取值范围是 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{x=>0,y 已知实数x,y满足{x=>0,y 已知实数x,y满足不等式组x≥0,y≥0,x+y≤1,则x^2+y^2-2x-2y的最小值 若实数xy满足不等式组x-2y≥0,x+y-3≥0,x-y-3≤0,则2x-y的最小值为? 若实数xy满足不等式组x-2y≥0,x+y-3≥0,x-y-3≤0,则2x-y的最小值 若实数x,y满足{x+y-2≥0 x≤4 y≥5 则s=x+y的最大值为? 若实数x,y满足y