若实数x,y满足x-y+1≤0,且x>0,则y/x的取值范围是?(请用线性规划解,

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≤0,且x>0,则y/x的取值范围是?(请用线性规划解, 若x,y为实数且满足 x^+3y^-12y+12=0 ,求y^x的值? x,y都是实数,且满足y 已知实数x、y满足xy>0,且8/xy+1/x+1/y=1, 若实数x,y满足不等式(x+3y-3≥0,2x-y-3≤0,x-my+1≥0,)且x+y的最大值为9,求实数m的值 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, 实数x,y满足{x-y+1>=0;y+1>=0;x+y+1 已知实数X,Y,Z,满足X^2-2X+Y=Z-1,且X+Y^2+1=0,试比较X,Y,Z的大小. 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x,y都是实数,且满足y 若x,y都是实数,且满足y 实数x,y满足x^2+y^2-6x+5=0,且x+2y+m 若实数x,y满足xy>0,且x^2y=2,则xy+x^2的最小值 若实数x,y满足xy>0,且x²y=2,则xy+x²的最小值是? 已知实数x,y满足x-y+2≥0且x+y-1≤0且x+2y+2≥0,则2x+y的取值范围为