대답: #7# 설명: #{(1+5/4)-(1+3/2)+(2+1/4)-1/6+5/2}+(5/3+1)# = #{(4/4+5/4)-(2/2+3/2)+(8/4+1/4)-1/6+5/2}+(5/3+3/3)# = #{9/4-5/2+9/4-1/6+5/2}+8/3# = #{9/4-10/4+9/4-1/6+5/2}+8/3# = #{8/4-1/6+5/2}+8/3# = #{24/12-2/12+30/12}+32/12# = #52/12+32/12# = #84/12=7#