设实数xy满足y≥x＋1 2y-4x-1≤0 2y＋x－11≤0,

设实数xy满足y≥x＋1 2y-4x-1≤0 2y＋x－11≤0, 设实数xy满足线性约束条件x+y≤3 x-y≥1 y≥0 设x，y满足约束条件x+y≤1y≤xy≥−2 设实数xy满足x+y-3≤0,y-x/2≥0,x-1≥0,则求u=y/x-x/y的取值范围 1、已知实数x、x满足x²＋y²－xy＋2x－y＋1＝0,试求x、y的值. 设实数x，y满足条件x≥0x≤yx+2y≤3 设实数x,y满足x^2+2xy+4y^2=1,则x+2y最大值 设实数x,y满足y≥x+1,2x-4y-1≤0 ,2y+x-11≤0 则y²/x的取值范围是 实数x、y满足x≥y≥1和2x^2-xy+5x-y+4=0,则x+y=___ 实数x'y满足x≥y≥1和2x^2-xy-5x+y+4=0求x'y的值 实数x y满足x≥y≥1和2x²-xy-5x+y+4=0求x+y之值 设实数x，y满足不等式组y+x≤1y-x≤1y≥0