已知实数x,y满足不等式组:2x-y=0,x+2y

问题描述:

已知实数x,y满足不等式组:2x-y=0,x+2y

m=6
z=x-y过(0,3)时z最小,(0,3)在直线x+2y=m上,所以m=6.