设z=x+2y,其中实数x,y满足x−y+1≥0x+y−2≤0x≥0y≥0
设z=x+2y,其中实数x,y满足x−y+1≥0x+y−2≤0x≥0y≥0
设Z=X+Y,其中X,Y满足X+2Y>=0,X-Y
设Z=x+y,其中实数x,y满足不等式x+2y>=0,x-y
设z=x+y,其中实数x,y满足{x+2y>=0,x-y
设z=kx+y,其中实数x,y满足x+y-2≥0x-2y+4≥02x-y-4≤0,若z的最大值为12,则实数k= ___
设变量x,y满足约束条件 {x-y≥0,x+y≤1,x+2y≥0},则函数Z=2x+y 的最大值?
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
设变量x,y满足约束条件x−y≥0x+y≤1x+2y≥1
已知实数x,y满足条件{2x-y+1≥0,2x+y≥0,x≤1,求z=x+3y的最小值.
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( )
设x y 满足约束条件 x≤0 x≤y 2x-y+1≥0 则z=3x+2y的最大值