8*(20-1.25)怎样简便 9.07-22.78/3.4怎样简便
问题描述:
8*(20-1.25)怎样简便 9.07-22.78/3.4怎样简便
答
8*(20-1.25)=8*20-8*1.25=160-10=150,
9.07-22.78/3.4=9.07-(23.8-1.02)/3.4=9.07-7+0.3=2.37