实数x,y满足x+2y-1≤0,x≥0,y≥0,则绝对值2x+y-1的取值范围

实数x,y满足x+2y-1≤0,x≥0,y≥0,则绝对值2x+y-1的取值范围 若实数x,y满足{x-y+1≥,x>0},则y/(x-1)的取值范围是 实数X.Y满足X*X+Y*Y-2X-2Y+1=0,则（Y-4）/（X-2）的取值范围是? 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? 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 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 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 设实数x，y满足约束条件x≥1且x≠2y≥1x+2y−5≤0，则z＝x+y−1x−2的取值范围为（　　） 实数x,y满足不等式组y≥0,x-y≥0,2x-y-2≤0,则w=(y-1)/(x+1)的取值范围是? 若实数x,y满足x+y+1≤0,x≥0.则y/（x-1）的取值范围 1.若实数X,Y满足不等式组 y≥0 x-y≤4 2x-y-2≥0,则W=(y-1)/(x+1)的取值范围是?