实数x,y满足①x+y+1≥0②2x-y+2≥0,若(-1,0)是使ax+y取得最大值的可行解,则实数a的取值范围是最好有图

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, 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x-ay-1>=0,2x+y>=0,x 已知实数x,y满足x²+y²-xy+2x-y+1=0 求x y 实数x,y满足{x-y+1>=0;y+1>=0;x+y+1 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 已知实数x,y满足2x-y≤2,y≤x,y≥0,则（y-1)/(x+1)的最大值是? 设实数x,y满足 x>=0 x-2y>=0 x-y-2 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 当实数x,y,满足约束条件{x>0 y>=x 2x+y+k 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｜ 设实数x,y满足方程组①x-y-2=0 ③2y-3 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. 实数x'y满足x≥y≥1和2x^2-xy-5x+y+4=0求x'y的值