设x,y满足约束条件x-2y+5=0,3-x≥0,x+y≥0且z=2x+y,求z的最小值.

设变量X,Y满足约束条件{X-Y+3>=0,X+Y>=0,-2 设变量x,y满足约束条件:x-y+3>=0 x+y>=0 -2 设x,y满足约束条件{x>=0,y>=x,4x+3y 设x,y满足约束条件x>=0 y>=x 4x+3y 设x,y满足约束条件x>=0 x>=y 2x-y 设x,y满足约束条件{x-y+5≥0,x+y≥0,x≤3}求z=(x+1)^2-y^2的最大值? 设X,Y满足约束条件X+Y 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 设实数x,y满足约束条件：x>=2;y>=x;2x+y 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 设x,y满足约束条件:x-y+1≥0,x+y-1≥0,x≤3.则z=2x-3y的最小值为? 设x,y满足约束条件x≦y,x+2y≦3,x≧0,则z=2x-y的最大值为 数学. 设x,y满足约束条件x≦y,x+2y≦3,x≧0,则z=2x-y的最大值为 设xy满足约束条件 x+y>=1 x-2y>=-2 3x-2y 若实数x,y满足约束条件x-y-2=0,2y-3 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