已知x,y满足约束条件x-y+2>=0,x+y>=0 x＜=1,求z=2x+4y的最大值

已知x,y满足约束条件：x-y+1>=0,x+y-2>=0,x 已知xy满足约束条件y=2 2X+y 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 已知x,y满足约束条件x-y+5>=0 x+y>=0 X 已知X,Y满足约束条件x-y+5>=0 x+y>=0 X 已知实数x,y满足约束条件:x>=2 y>=2 x+y 已知x,y 满足约束条件y>=2|x|,x+y-1 已知x,y满足约束条件x+y==-1,y>=1 若0= 设x,y满足约束条件x>=0 x>=y 2x-y 当实数x,y,满足约束条件{x>0 y>=x 2x+y+k 已知变量x,y满足约束条件1 已知x,y满足约束条件1 已知变量x满足约束条件1：x-y+2=1；3:x+y-7 已知实数x,y满足约束条件x+y>3,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 已知x,y满足约束条件 2x+5y>=10 2x-3y>=-6 2x+y