3/4－0.6×﹙2＋5/12－1.75﹚=0.75－0.6×﹙29/12﹚＋0.6×1.75=0.75－1.45＋1.05=1.75＋1.05－1.45=0.35
3/4-0.6×(29/12-1.75)=3/4-3/5×(29/12-7/4)=3/4-3/5×(29/12-21/12)=3/4-3/5×2/3=3/4-2/5=15/20-8/20=7/20
