实数x,y满足{x+2y-4+丨x+2y-4丨≤6,1≤x≤5,1≤y≤3},求u=(x^2+y^2)/xy的取值范围!
设实数x,y满足{x-y-2≤0 x+2y-5≥0 y-2≤0.(1)求z=x+y的取值范围;(2)求u=(x+y)/x
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
已知实数x,y满足x²+2xy-1=0,求x+y的取值范围.当0≤x≤4时,求y=根号x-x的最大值和最小值.
已知实数x,y满足(x-y+6)(x+y-6)≥0,1≤x≤4,(1)求x^2+y^(2)-2的取值范围,(2)求y/(
已知实数x,y满足x>0,y>0,且2x-y≤0,x-3y+5≥0,则z=(1/4)^x(1/2)^y的取值范围
已知实数x,y满足x^2+y^2=4,求下列各式的取值范围:(1)3x+4y.(2)xy
实数xy满足1≤y≤x,且2x²-5x+4=y(x-1),则x+y的值为
设x、y满足约束条件{x≥0 y≥x 4x+3y≤12}则2y+3/x+1的取值范围是?
若实数xy满足y≤2x+3,且y=x^2,则y/(x-12)的取值范围是
已知变量xy满足约束条件x≥-1,y≥x,3x+2y≤5,则2x+y的取值范围是
设实数x,y满足{x-y-2≤0,x+2y-5≥0,y-2≤0.求z=x+y和z=x+y/x的取值范围
已知实数x,y满足(x-y+6)(x+y-6)≥0,1≤x≤4,第(1)问,求x的平方+y的平方-2的取值范围,第(2)