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,则y²/x的取值范围

设实数x,y满足x^2+2xy+4y^2=1,则x+2y最大值 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,则y²/x的取值范围 设实数x,y满足x²+1/2y²4-xy+2y=0.则x=___,y=___ 若实数xy满足x-y+1 设实数x,y满足x^2+2xy-1=0则x+y的取值范围是 设实数x,y满足x^2+2xy-1=0,则x+y的取值范围是 设实数x,y满足x^2+2xy-1=0,则x+y的取值范围是 设实数X,Y满足X平方+2XY-1=0,则X+Y的取值范围是多少? 设实数x、y满足x+2xy-1=0,则x+y的取值范围是 设实数x,y满足x平方+2xy-1=0,求x+y的取值范围 设xy满足约束条件x-ay≤2 x-y≥-1 2x+y≥4 若z=x+y既有最大值又有最小值设xy满足约束条件x-ay≤2 x-y≥-1 2x+y≥4 若z=x+y既有最大值又有最小值 求实数a范围 设实数X,Y满足x²+2xy+4y²=1,则x+2y的最大值为 .PS： 设实数x,y满足x2+2xy-1=0,则x+y的取值范围是? 设实数x,y满足x2-2xy-1=0 则x-y的取值范围是 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2X^2-XY-5X+Y+4=0,则X+Y= 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 x*+y*+xy=1,则 x+y 的最大值是多少?*代表平方