6.4*0.25*12.5用简便方法怎么算 日期:2010-09-19 17:18:40 人气:1 6.4*0.25*12.5用简便方法怎么算 6.4*0.25*12.5 =6.4÷4×12.5 =1.6×10+1.6×5/2 =16+4 =20