设x,y满足约束条件x-4y

设X,Y满足约束条件X+Y 设X,Y满足约束条件{X-4Y 设x,y满足约束条件x>=0 y>=x 4x+3y 设变量x,y满足约束条件x-y>-1,x+y>1,3x-y 设xy满足约束条件x>=0 y>=0 4x+3y=0 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 设实数X,Y满足约束条件{X+2Y等于-1；Y>等于0,则 设x，y满足约束条件x+y≤1y≤xy≥−2 设x,y满足约束条件,x≧0,3x+4y≧4,y≧0,则x²+y²+2x的最小值为 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? 设变量x,y满足约束条件x-y>=-1,x+y>=1,3x-y