123쪽-2/5/1/4/5/124쪽~125쪽/4/2/5/4/3/5/5/4/3/4/400g/a=6분의1,b=10분의1,6분의1x+10분의1(7-x)>=1,x>=2분의9,5대
당신은 어느 그룹입니까?