已知x,y满足约束条件{x>=1,y=x},则目标函数z=根号（x2+y2）的最小值是

已知x,y满足约束条件：x-y+1>=0,x+y-2>=0,x 已知x,y 满足约束条件y>=2|x|,x+y-1 已知变量x,y满足约束条件1 已知x,y满足约束条件1 已知xy满足约束条件y=2 2X+y 已知变量x满足约束条件1：x-y+2=1；3:x+y-7 已知x,y满足约束条件x>=1,x-3y 已知x,y满足约束条件x+y==-1,y>=1 若0= 已知变量x,y满足约束条件x+2y-3=0,y-1 已知变量x,y满足约束条件x+2y-3=0,y-1 已知x,y满足约束条件x-y+5>=0 x+y>=0 X 已知X,Y满足约束条件x-y+5>=0 x+y>=0 X 设x,y满足约束条件x+y>=1,x-y>=-1,2x-y 设x,y满足约束条件x+y>=1,x-y>=-1,2x-y 变量x,y满足约束条件,x+y>=3,x-y>=-1,2x-y 已知变量x,y满足约束条件（x-y+2=1 已知实数x,y满足约束条件:x>=2 y>=2 x+y 已知实数x,y满足约束条件x+y=1,y>=1,则z=y/x的最小值