设xy满足约束条件x>=0 y>=0 4x+3y=0y>=04x+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 y>=x 4x+3y 设xy满足约束条件x>=0 y>=0 4x+3y=0y>=04x+3y 设x,y满足约束条件x>=0 x>=y 2x-y 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xy满足约束条件x≥0,x≥y,2x-y≤1,求z=3x+2y的最大值 xy满足约束条件x-ay-1>=0,2x+y>=0,x 设变量xy满足约束条件x-y≥0,x+y-2≥0,3x-y-6≤0则目标函数z=2x-y设变量xy满足约束条件x-y≥0,x+y-2≥0,3x-y-6≤0则目标函数z=2x-y的最小值为（ ）. 已知xy满足约束条件y=2 2X+y 设xy满足约束条件 x+y>=1 x-2y>=-2 3x-2y 实数x,y满足约束条件.求范围实数x,y满足约束条件x-y+2>=0 x+y-4>0x xy满足约束条件x-ay-1>=0,2x+y>=0,x-1/2 a》0或a0 设xy满足约束条件x-ay≤2 x-y≥-1 2x+y≥4 若z=x+y既有最大值又有最小值设xy满足约束条件x-ay≤2 x-y≥-1 2x+y≥4 若z=x+y既有最大值又有最小值 求实数a范围 已知xy满足约束条件x+2y-4≤0 x-y-1≤0 x+2≥0求目标函数z=x+2y+2的最大值已知xy满足约束条件x+2y-4≤0 x-y-1≤0 x+2≥0求目标函数z=x+2y+2的最大值和最小值 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?